condition mean min max ZT0-3 0.6114131666666667 0.3492875 0.984522 ZT4-7 0.8180075 0.8180075 0.8180075 ZT8-11 2.035235 2.035235 2.035235 ZT12-15 1.6604345 0.857984 2.462885 ZT16-19 3.014245 3.014245 3.014245 ZT20-23 0.8206005 0.8206005 0.8206005