condition mean min max ZT0-3 49.77415 49.77415 49.77415 ZT4-7 38.15105 38.15105 38.15105 ZT8-11 21.866799999999998 21.866799999999998 21.866799999999998 ZT12-15 30.11955 30.11955 30.11955 ZT16-19 64.15365 64.15365 64.15365 ZT20-23 50.54745 50.54745 50.54745