I have a problem with my checkboxes

I want a form with checkboxes that will have all the severity levels and when the user (e.g selects only the error i want to select only the errors from watchdog. My problem now is that in watchdog the severities are with numbers :/ :/ :/.....here is my form:

/**
 * Settings form for the user.
 */
function kkkk_admin_settings() {

    // Form for the severity checkboxes.
    $kkkk_severity_levels = variable_get('kkkk_severity_levels', array());

    // Declare empty options array.
    $kkkk_severity_options = array();

    // Loop through each severity level and push to options array for form.
    foreach (watchdog_severity_levels() as $number_select => $severity) {
      $kkkk_severity_options[$severity] = drupal_ucfirst(
        $severity);
    }
    $kkkk_form['kkkk_severity_levels'] = array(
      '#type'          => 'checkboxes',
      '#title'         => t('Type of log messages'),
      '#options'       => $kkkk_severity_options,
      '#default_value' => array_values($kkkk_severity_levels),
      '#required'      => TRUE,
    );
    dsm($kkkk_severity_levels);
    return system_settings_form($kkkk_form);
  }
}

this dsm($kkkk_severity_levels); if i have selected error gets me out:

error (String, 4 characters ) error
emergency (Integer) 0
alert (Integer) 0
critical (Integer) 0
warning (Integer) 0
notice (Integer) 0
info (Integer) 0
debug (Integer) 0

I need to take out :

error (String, 4 characters ) 3
    emergency (Integer) 0
    alert (Integer) 0
    critical (Integer) 0
    warning (Integer) 0
    notice (Integer) 0
    info (Integer) 0
    debug (Integer) 0

where 3 is the number of the error severity. I need to take this number in order in my function to select only the error messages from watchdog.... Could someone help?? If I need a new form could you help with that form plz ?? I am new in coding.. :/ :/ :/

and i call it in my .module file as :

$severity_levels = variable_get('kkkk_severity_levels', array());