condition mean min max ZT0-3 49.825654 49.825654 49.825654 ZT4-7 50.350528 50.350528 50.350528 ZT8-11 51.548056 51.548056 51.548056 ZT12-15 51.7973885 51.7973885 51.7973885 ZT16-19 46.566466 46.566466 46.566466 ZT20-23 57.343019 57.343019 57.343019