condition mean min max ZT0-3 27.87175 25.19395 30.54955 ZT4-7 26.64215 26.64215 26.64215 ZT8-11 30.847350000000002 30.847350000000002 30.847350000000002 ZT12-15 0 0 0 ZT16-19 37.67165 37.67165 37.67165 ZT20-23 31.6967 31.6967 31.6967