condition mean min max ZT0-3 21.898491 21.898491 21.898491 ZT4-7 23.16103 23.16103 23.16103 ZT8-11 30.392479 30.392479 30.392479 ZT12-15 24.5022515 24.5022515 24.5022515 ZT16-19 15.856781 15.856781 15.856781 ZT20-23 14.620299499999998 14.620299499999998 14.620299499999998