condition mean min max ZT0-3 29.648176 29.648176 29.648176 ZT4-7 33.5179015 33.5179015 33.5179015 ZT8-11 30.589484 30.589484 30.589484 ZT12-15 97.85532549999999 97.85532549999999 97.85532549999999 ZT16-19 30.9028105 30.9028105 30.9028105 ZT20-23 42.0884655 42.0884655 42.0884655