condition mean min max ZT0-3 10.283303333333333 4.53931 14.36085 ZT4-7 3.94828 3.94828 3.94828 ZT8-11 12.2821 12.2821 12.2821 ZT12-15 7.9866150000000005 6.63877 9.33446 ZT16-19 12.2051 12.2051 12.2051 ZT20-23 16.3173 16.3173 16.3173