condition mean min max ZT0-3 22.549999999999997 22.549999999999997 22.549999999999997 ZT4-7 12.6 12.6 12.6 ZT8-11 35.55 35.55 35.55 ZT12-15 53.85 53.85 53.85 ZT16-19 44.55 44.55 44.55 ZT20-23 75.8 75.8 75.8