condition mean min max ZT0-3 26.82095 24.8659 28.776 ZT4-7 24.41975 24.41975 24.41975 ZT8-11 36.109049999999996 36.109049999999996 36.109049999999996 ZT12-15 0 0 0 ZT16-19 37.957049999999995 37.957049999999995 37.957049999999995 ZT20-23 35.08605 35.08605 35.08605