condition mean min max ZT0-3 36.05 36.05 36.05 ZT4-7 3.5 3.5 3.5 ZT8-11 31.0 31.0 31.0 ZT12-15 11.7 11.7 11.7 ZT16-19 11.15 11.15 11.15 ZT20-23 24.299999999999997 24.299999999999997 24.299999999999997