condition mean min max ZT0-3 34.15 34.15 34.15 ZT4-7 17.7 17.7 17.7 ZT8-11 6.0 6.0 6.0 ZT12-15 36.2 36.2 36.2 ZT16-19 40.0 40.0 40.0 ZT20-23 44.5 44.5 44.5