condition mean min max ZT0-3 2.5310719076433332 0.7501957229299999 4.858335 ZT4-7 5.05366 5.05366 5.05366 ZT8-11 6.585805 6.585805 6.585805 ZT12-15 16.1572825 10.191215 22.123350000000002 ZT16-19 8.0702 8.0702 8.0702 ZT20-23 4.113217 4.113217 4.113217