condition mean min max ZT0-3 31.05 31.05 31.05 ZT4-7 11.8 11.8 11.8 ZT8-11 36.85 36.85 36.85 ZT12-15 18.849999999999998 18.849999999999998 18.849999999999998 ZT16-19 19.2 19.2 19.2 ZT20-23 37.15 37.15 37.15