condition mean min max ZT0-3 31.439966 31.439966 31.439966 ZT4-7 51.19024949999999 51.19024949999999 51.19024949999999 ZT8-11 77.70548550000001 77.70548550000001 77.70548550000001 ZT12-15 147.4318825 147.4318825 147.4318825 ZT16-19 76.4013515 76.4013515 76.4013515 ZT20-23 104.114491 104.114491 104.114491