condition mean min max ZT0-3 0.34965583333333333 0.275312 0.45667450000000004 ZT4-7 0.5613245 0.5613245 0.5613245 ZT8-11 3.882055 3.882055 3.882055 ZT12-15 3.2627749999999995 1.67498 4.850569999999999 ZT16-19 0.493241 0.493241 0.493241 ZT20-23 0.3839765 0.3839765 0.3839765