condition mean min max ZT0-3 15.8 15.8 15.8 ZT4-7 10.7 10.7 10.7 ZT8-11 6.7 6.7 6.7 ZT12-15 22.8 22.8 22.8 ZT16-19 20.85 20.85 20.85 ZT20-23 26.849999999999998 26.849999999999998 26.849999999999998