condition mean min max ZT0-3 39.15 39.15 39.15 ZT4-7 23.8 23.8 23.8 ZT8-11 13.05 13.05 13.05 ZT12-15 4.25 4.25 4.25 ZT16-19 13.85 13.85 13.85 ZT20-23 6.8999999999999995 6.8999999999999995 6.8999999999999995