diff --git a/mod/quiz/report/overview/db/upgrade.php b/mod/quiz/report/overview/db/upgrade.php
index e1bef7fea5f..69f821fe7d0 100644
--- a/mod/quiz/report/overview/db/upgrade.php
+++ b/mod/quiz/report/overview/db/upgrade.php
@@ -36,195 +36,6 @@ function xmldb_quiz_overview_upgrade($oldversion) {
 
     $dbman = $DB->get_manager();
 
-    //===== 1.9.0 upgrade line ======//
-
-    if ($oldversion < 2009091400) {
-
-        // Define table quiz_question_regrade to be created
-        $table = new xmldb_table('quiz_question_regrade');
-
-        // Adding fields to table quiz_question_regrade
-        $table->add_field('id', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
-        $table->add_field('questionid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null);
-        $table->add_field('attemptid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null);
-        $table->add_field('newgrade', XMLDB_TYPE_NUMBER, '12, 7', null,
-                XMLDB_NOTNULL, null, null);
-        $table->add_field('oldgrade', XMLDB_TYPE_NUMBER, '12, 7', null,
-                XMLDB_NOTNULL, null, null);
-        $table->add_field('regraded', XMLDB_TYPE_INTEGER, '4', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null);
-        $table->add_field('timemodified', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null);
-
-        // Adding keys to table quiz_question_regrade
-        $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
-
-        // Conditionally launch create table for quiz_question_regrade
-        if (!$dbman->table_exists($table)) {
-            $dbman->create_table($table);
-        }
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2009091400, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040600) {
-
-        // Wipe the quiz_question_regrade before we changes its structure. The data
-        // It contains is not important long-term, and it is almost impossible to upgrade.
-        $DB->delete_records('quiz_question_regrade');
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040600, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040601) {
-
-        // Rename field attemptid on table quiz_question_regrade to questionusageid
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('attemptid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null, 'id');
-
-        // Launch rename field questionusageid
-        $dbman->rename_field($table, $field, 'questionusageid');
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040601, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040602) {
-
-        // Define field slot to be added to quiz_question_regrade
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('slot', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null, 'questionusageid');
-
-        // Conditionally launch add field slot
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040602, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040603) {
-
-        // Define field questionid to be dropped from quiz_question_regrade
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('questionid');
-
-        // Conditionally launch drop field questionusageid
-        if ($dbman->field_exists($table, $field)) {
-            $dbman->drop_field($table, $field);
-        }
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040603, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040604) {
-
-        // Rename field newgrade on table quiz_question_regrade to newfraction
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('newgrade', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'slot');
-
-        // Launch rename field newfraction
-        $dbman->rename_field($table, $field, 'newfraction');
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040604, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040605) {
-
-        // Rename field oldgrade on table quiz_question_regrade to oldfraction
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('oldgrade', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'slot');
-
-        // Launch rename field newfraction
-        $dbman->rename_field($table, $field, 'oldfraction');
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040605, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040606) {
-
-        // Changing precision of field newfraction on table quiz_question_regrade to (12, 7)
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('newfraction', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'slot');
-
-        // Launch change of precision for field newfraction
-        $dbman->change_field_precision($table, $field);
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040606, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010040607) {
-
-        // Changing precision of field oldfraction on table quiz_question_regrade to (12, 7)
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('oldfraction', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'slot');
-
-        // Launch change of precision for field newfraction
-        $dbman->change_field_precision($table, $field);
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010040607, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010082700) {
-
-        // Changing nullability of field newfraction on table quiz_question_regrade to null
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('newfraction', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'slot');
-
-        // Launch change of nullability for field newfraction
-        $dbman->change_field_notnull($table, $field);
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010082700, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2010082701) {
-
-        // Changing nullability of field oldfraction on table quiz_question_regrade to null
-        $table = new xmldb_table('quiz_question_regrade');
-        $field = new xmldb_field('oldfraction', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'slot');
-
-        // Launch change of nullability for field newfraction
-        $dbman->change_field_notnull($table, $field);
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2010082701, 'quiz', 'overview');
-    }
-
-    if ($oldversion < 2011021600) {
-
-        // Define table quiz_question_regrade to be renamed to quiz_overview_regrades
-        // so that it follows the Moodle coding guidelines.
-        $table = new xmldb_table('quiz_question_regrade');
-
-        // Launch rename table for quiz_question_regrade
-        $dbman->rename_table($table, 'quiz_overview_regrades');
-
-        // overview savepoint reached
-        upgrade_plugin_savepoint(true, 2011021600, 'quiz', 'overview');
-    }
-
-    // Moodle v2.1.0 release upgrade line
-    // Put any upgrade step following this
 
     // Moodle v2.2.0 release upgrade line
     // Put any upgrade step following this
diff --git a/mod/quiz/report/statistics/db/upgrade.php b/mod/quiz/report/statistics/db/upgrade.php
index 6ee18fd6b6b..97762e5a273 100644
--- a/mod/quiz/report/statistics/db/upgrade.php
+++ b/mod/quiz/report/statistics/db/upgrade.php
@@ -31,372 +31,10 @@ defined('MOODLE_INTERNAL') || die();
  * Quiz statistics report upgrade code.
  */
 function xmldb_quiz_statistics_upgrade($oldversion) {
-
     global $DB;
 
     $dbman = $DB->get_manager();
 
-    // In Moodle 2.0, this table was incorrectly called quiz_report, which breaks
-    // the moodle coding guidelines. In 2.1 it was renamed to quiz_reports. This
-    // bit of code lets us handle all the various upgrade paths without problems.
-    if ($dbman->table_exists('quiz_reports')) {
-        $quizreportstablename = 'quiz_reports';
-    } else {
-        $quizreportstablename = 'quiz_report';
-    }
-
-    //===== 1.9.0 upgrade line ======//
-
-    if ($oldversion < 2008072401) {
-        //register cron to run every 5 hours.
-        $DB->set_field($quizreportstablename, 'cron', HOURSECS*5, array('name'=>'statistics'));
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008072401, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008072500) {
-
-        // Define field s to be added to quiz_question_statistics
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('s', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, '0', 'subquestion');
-
-        // Conditionally launch add field s
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008072500, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008072800) {
-
-        // Define field maxgrade to be added to quiz_question_statistics
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('maxgrade', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                null, null, null, 'subquestions');
-
-        // Conditionally launch add field maxgrade
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008072800, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008072801) {
-
-        // Define field positions to be added to quiz_question_statistics
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('positions', XMLDB_TYPE_TEXT, 'medium', null,
-                null, null, null, 'maxgrade');
-
-        // Conditionally launch add field positions
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008072801, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008081500) {
-        // Changing type of field maxgrade on table quiz_question_statistics to number
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('maxgrade', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'subquestions');
-
-        // Launch change of type for field maxgrade
-        $dbman->change_field_type($table, $field);
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008081500, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008082600) {
-
-        // Define table quiz_question_response_stats to be created
-        $table = new xmldb_table('quiz_question_response_stats');
-
-        // Adding fields to table quiz_question_response_stats
-        $table->add_field('id', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
-        $table->add_field('quizstatisticsid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null);
-        $table->add_field('questionid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null);
-        $table->add_field('anssubqid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                null, null, null);
-        $table->add_field('response', XMLDB_TYPE_TEXT, 'big', null,
-                null, null, null);
-        $table->add_field('rcount', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                null, null, null);
-        $table->add_field('credit', XMLDB_TYPE_NUMBER, '15, 5', null,
-                XMLDB_NOTNULL, null, null);
-
-        // Adding keys to table quiz_question_response_stats
-        $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
-
-        // Conditionally launch create table for quiz_question_response_stats
-        if (!$dbman->table_exists($table)) {
-            $dbman->create_table($table);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008082600, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008090500) {
-        //delete all cached results first
-        $DB->delete_records('quiz_statistics');
-        $DB->delete_records('quiz_question_statistics');
-        $DB->delete_records('quiz_question_response_stats');
-        // Define field anssubqid to be dropped from quiz_question_response_stats
-        $table = new xmldb_table('quiz_question_response_stats');
-        $field = new xmldb_field('anssubqid');
-
-        // Conditionally launch drop field subqid
-        if ($dbman->field_exists($table, $field)) {
-            $dbman->drop_field($table, $field);
-        }
-
-        // Define field subqid to be added to quiz_question_response_stats
-        $field = new xmldb_field('subqid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null, 'questionid');
-
-        // Conditionally launch add field subqid
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // Define field aid to be added to quiz_question_response_stats
-        $field = new xmldb_field('aid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, null, 'subqid');
-
-        // Conditionally launch add field aid
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008090500, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008111000) {
-        // Delete all cached results first
-        $DB->delete_records('quiz_statistics');
-        $DB->delete_records('quiz_question_statistics');
-        $DB->delete_records('quiz_question_response_stats');
-
-        // Define field anssubqid to be dropped from quiz_question_response_stats
-        $table = new xmldb_table('quiz_question_statistics');
-        // Define field subqid to be added to quiz_question_response_stats
-        $field = new xmldb_field('negcovar', XMLDB_TYPE_INTEGER, '2', XMLDB_UNSIGNED,
-                XMLDB_NOTNULL, null, '0', 'effectiveweight');
-
-        // Conditionally launch add field subqid
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008111000, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008112100) {
-        $DB->set_field($quizreportstablename, 'capability', 'quizreport/statistics:view',
-                array('name'=>'statistics'));
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008112100, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008112101) {
-        // Removed UNSIGNED from all NUMBER columns in the quiz_statistics table.
-        $table = new xmldb_table('quiz_statistics');
-
-        // Change of sign for field firstattemptsavg
-        $field = new xmldb_field('firstattemptsavg', XMLDB_TYPE_NUMBER, '15, 5', null,
-                null, null, null, 'allattemptscount');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field allattemptsavg
-        $field = new xmldb_field('allattemptsavg', XMLDB_TYPE_NUMBER, '15, 5', null,
-                null, null, null, 'firstattemptsavg');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field median
-        $field = new xmldb_field('median', XMLDB_TYPE_NUMBER, '15, 5', null,
-                null, null, null, 'allattemptsavg');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field standarddeviation
-        $field = new xmldb_field('standarddeviation', XMLDB_TYPE_NUMBER, '15, 5', null,
-                null, null, null, 'median');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field errorratio
-        $field = new xmldb_field('errorratio', XMLDB_TYPE_NUMBER, '15, 10', null,
-                null, null, null, 'cic');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field standarderror
-        $field = new xmldb_field('standarderror', XMLDB_TYPE_NUMBER, '15, 10', null,
-                null, null, null, 'errorratio');
-        $dbman->change_field_unsigned($table, $field);
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008112101, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008112102) {
-        // Removed UNSIGNED from all NUMBER columns in the quiz_question_statistics table.
-        $table = new xmldb_table('quiz_question_statistics');
-
-        // Change of sign for field effectiveweight
-        $field = new xmldb_field('effectiveweight', XMLDB_TYPE_NUMBER, '15, 5', null,
-                null, null, null, 's');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field sd
-        $field = new xmldb_field('sd', XMLDB_TYPE_NUMBER, '15, 10', null,
-                null, null, null, 'discriminativeefficiency');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field facility
-        $field = new xmldb_field('facility', XMLDB_TYPE_NUMBER, '15, 10', null,
-                null, null, null, 'sd');
-        $dbman->change_field_unsigned($table, $field);
-
-        // Change of sign for field maxgrade
-        $field = new xmldb_field('maxgrade', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'subquestions');
-        $dbman->change_field_unsigned($table, $field);
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008112102, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2008112103) {
-        // Removed UNSIGNED from all NUMBER columns in the quiz_question_response_stats table.
-        $table = new xmldb_table('quiz_question_response_stats');
-
-        // Change of sign for field credit
-        $field = new xmldb_field('credit', XMLDB_TYPE_NUMBER, '15, 5', null,
-                XMLDB_NOTNULL, null, null, 'rcount');
-        $dbman->change_field_unsigned($table, $field);
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2008112103, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2010031700) {
-
-        // Define field randomguessscore to be added to quiz_question_statistics
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('randomguessscore', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'positions');
-
-        // Conditionally launch add field randomguessscore
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2010031700, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2010032400) {
-
-        // Define field slot to be added to quiz_question_statistics
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('slot', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, null,
-                null, null, 'questionid');
-
-        // Conditionally launch add field slot
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2010032400, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2010032401) {
-
-        // Delete all cached data
-        $DB->delete_records('quiz_question_response_stats');
-        $DB->delete_records('quiz_question_statistics');
-        $DB->delete_records('quiz_statistics');
-
-        // Rename field maxgrade on table quiz_question_statistics to maxmark
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('maxgrade', XMLDB_TYPE_NUMBER, '12, 7', XMLDB_UNSIGNED,
-                null, null, null, 'subquestions');
-
-        // Launch rename field maxmark
-        $dbman->rename_field($table, $field, 'maxmark');
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2010032401, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2010062200) {
-
-        // Changing nullability of field aid on table quiz_question_response_stats to null
-        $table = new xmldb_table('quiz_question_response_stats');
-        $field = new xmldb_field('aid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
-                null, null, null, 'subqid');
-
-        // Launch change of nullability for field aid
-        $dbman->change_field_notnull($table, $field);
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2010062200, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2010070301) {
-
-        // Changing type of field maxmark on table quiz_question_statistics to number
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('maxmark', XMLDB_TYPE_NUMBER, '12, 7', XMLDB_UNSIGNED,
-                null, null, null, 'subquestions');
-
-        // Launch change of type for field maxmark
-        $dbman->change_field_type($table, $field);
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2010070301, 'quiz', 'statistics');
-    }
-
-    if ($oldversion < 2011021500) {
-        $DB->set_field($quizreportstablename, 'capability', 'quiz/statistics:view',
-                array('name' => 'statistics'));
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2011021500, 'quiz', 'statistics');
-    }
-
-    // Signed fixes - MDL-28032
-    if ($oldversion < 2011062600) {
-
-        // Changing sign of field maxmark on table quiz_question_statistics to signed
-        $table = new xmldb_table('quiz_question_statistics');
-        $field = new xmldb_field('maxmark', XMLDB_TYPE_NUMBER, '12, 7', null,
-                null, null, null, 'subquestions');
-
-        // Launch change of sign for field maxmark
-        $dbman->change_field_unsigned($table, $field);
-
-        // statistics savepoint reached
-        upgrade_plugin_savepoint(true, 2011062600, 'quiz', 'statistics');
-    }
-
-    // Moodle v2.1.0 release upgrade line
-    // Put any upgrade step following this
 
     // Moodle v2.2.0 release upgrade line
     // Put any upgrade step following this