condition mean min max ZT0-3 23.458433333333332 13.12715 32.50665 ZT4-7 14.89765 14.89765 14.89765 ZT8-11 10.72315 10.72315 10.72315 ZT12-15 19.378375 18.60865 20.1481 ZT16-19 24.914900000000003 24.914900000000003 24.914900000000003 ZT20-23 33.09135 33.09135 33.09135