condition mean min max ZT0-3 6.633649273750001 4.451025375 8.8162731725 ZT4-7 7.05483068075 6.582341873500001 7.527319488 ZT8-11 10.17535079525 7.343120194500001 13.007581396 ZT12-15 14.4234842475 14.33482012 14.512148374999999 ZT16-19 13.0615053725 12.58634983 13.536660914999999 ZT20-23 16.1937458325 15.447146720000001 16.940344945