condition mean min max ZT0-3 1.39876 1.39876 1.39876 ZT4-7 1.1435404999999998 1.1435404999999998 1.1435404999999998 ZT8-11 0.8005585 0.8005585 0.8005585 ZT12-15 0.5417384999999999 0.5417384999999999 0.5417384999999999 ZT16-19 1.287439 1.287439 1.287439 ZT20-23 1.2399149999999999 1.2399149999999999 1.2399149999999999