condition mean min max ZT0-3 36.39608333333334 27.22815 45.8059 ZT4-7 26.14695 26.14695 26.14695 ZT8-11 23.0133 23.0133 23.0133 ZT12-15 30.221025 29.5702 30.871850000000002 ZT16-19 39.233000000000004 39.233000000000004 39.233000000000004 ZT20-23 50.011849999999995 50.011849999999995 50.011849999999995