condition mean min max ZT0-3 0.8055921666666667 0.40188650000000004 1.3551845 ZT4-7 1.17606 1.17606 1.17606 ZT8-11 0.9213285 0.9213285 0.9213285 ZT12-15 0.79557875 0.4719755 1.119182 ZT16-19 1.1002960000000002 1.1002960000000002 1.1002960000000002 ZT20-23 1.4312 1.4312 1.4312