condition mean min max ZT0-3 38.0537 38.0537 38.0537 ZT4-7 40.9765 40.9765 40.9765 ZT8-11 31.71615 31.71615 31.71615 ZT12-15 32.85255 32.85255 32.85255 ZT16-19 31.111150000000002 31.111150000000002 31.111150000000002 ZT20-23 34.3272 34.3272 34.3272