condition mean min max ZT0-3 20.445749999999997 20.445749999999997 20.445749999999997 ZT4-7 16.2427 16.2427 16.2427 ZT8-11 13.96995 13.96995 13.96995 ZT12-15 18.165 18.165 18.165 ZT16-19 25.3433 25.3433 25.3433 ZT20-23 22.59035 22.59035 22.59035