condition mean min max ZT0-3 29.001350000000002 29.001350000000002 29.001350000000002 ZT4-7 39.869299999999996 39.869299999999996 39.869299999999996 ZT8-11 40.9041 40.9041 40.9041 ZT12-15 34.06895 34.06895 34.06895 ZT16-19 17.9424 17.9424 17.9424 ZT20-23 13.71605 13.71605 13.71605