condition mean min max ZT0-3 9.538025 9.538025 9.538025 ZT4-7 9.402560000000001 9.402560000000001 9.402560000000001 ZT8-11 9.099764500000001 9.099764500000001 9.099764500000001 ZT12-15 9.550985 9.550985 9.550985 ZT16-19 8.8621295 8.8621295 8.8621295 ZT20-23 8.832342 8.832342 8.832342