condition mean min max ZT0-3 9.749625 6.23601 13.400500000000001 ZT4-7 5.344435 5.344435 5.344435 ZT8-11 9.363425 9.363425 9.363425 ZT12-15 14.193774999999999 13.9016 14.485949999999999 ZT16-19 14.7398 14.7398 14.7398 ZT20-23 24.44845 24.44845 24.44845