condition mean min max ZT0-3 39.257149999999996 39.257149999999996 39.257149999999996 ZT4-7 33.214 33.214 33.214 ZT8-11 27.5379 27.5379 27.5379 ZT12-15 29.06375 29.06375 29.06375 ZT16-19 30.62115 30.62115 30.62115 ZT20-23 55.3312 55.3312 55.3312