condition mean min max ZT0-3 18.364125 6.033474999999999 25.87085 ZT4-7 7.30935 7.30935 7.30935 ZT8-11 7.65439 7.65439 7.65439 ZT12-15 11.786760000000001 10.27417 13.29935 ZT16-19 17.229 17.229 17.229 ZT20-23 24.702199999999998 24.702199999999998 24.702199999999998