condition mean min max ZT0-3 29.208283333333334 24.50825 32.62935 ZT4-7 26.49505 26.49505 26.49505 ZT8-11 20.79305 20.79305 20.79305 ZT12-15 27.454 25.853450000000002 29.05455 ZT16-19 24.4551 24.4551 24.4551 ZT20-23 30.89465 30.89465 30.89465