condition mean min max ZT0-3 17.475823333333334 6.67117 24.4822 ZT4-7 10.05249 10.05249 10.05249 ZT8-11 12.688600000000001 12.688600000000001 12.688600000000001 ZT12-15 20.826 17.12175 24.530250000000002 ZT16-19 37.5663 37.5663 37.5663 ZT20-23 50.914 50.914 50.914