condition mean min max ZT0-3 18.002041666666667 2.26724 47.64165 ZT4-7 30.7603 30.7603 30.7603 ZT8-11 18.4465 18.4465 18.4465 ZT12-15 24.36035 12.47325 36.24745 ZT16-19 6.42248 6.42248 6.42248 ZT20-23 5.40904 5.40904 5.40904