condition mean min max ZT0-3 309.596387 309.596387 309.596387 ZT4-7 388.27561449999996 388.27561449999996 388.27561449999996 ZT8-11 411.3729105 411.3729105 411.3729105 ZT12-15 494.8011745 494.8011745 494.8011745 ZT16-19 439.6876985 439.6876985 439.6876985 ZT20-23 407.74636799999996 407.74636799999996 407.74636799999996