condition mean min max ZT0-3 14.0 14.0 14.0 ZT4-7 7.0 7.0 7.0 ZT8-11 17.15 17.15 17.15 ZT12-15 29.6 29.6 29.6 ZT16-19 36.0 36.0 36.0 ZT20-23 35.55 35.55 35.55