condition mean min max ZT0-3 17.2258 17.2258 17.2258 ZT4-7 12.338049999999999 12.338049999999999 12.338049999999999 ZT8-11 15.932099999999998 15.932099999999998 15.932099999999998 ZT12-15 17.94755 17.94755 17.94755 ZT16-19 26.643549999999998 26.643549999999998 26.643549999999998 ZT20-23 20.06375 20.06375 20.06375