condition mean min max ZT0-3 18.017726666666668 9.91588 22.143900000000002 ZT4-7 12.1269 12.1269 12.1269 ZT8-11 14.5402 14.5402 14.5402 ZT12-15 12.937925 12.16455 13.7113 ZT16-19 17.688299999999998 17.688299999999998 17.688299999999998 ZT20-23 25.04795 25.04795 25.04795