condition mean min max ZT0-3 6.9168199999999995 6.9168199999999995 6.9168199999999995 ZT4-7 5.74222 5.74222 5.74222 ZT8-11 5.400925 5.400925 5.400925 ZT12-15 5.695845 5.695845 5.695845 ZT16-19 7.8011800000000004 7.8011800000000004 7.8011800000000004 ZT20-23 7.882815 7.882815 7.882815