condition mean min max ZT0-3 31.4 31.4 31.4 ZT4-7 50.7 50.7 50.7 ZT8-11 20.45 20.45 20.45 ZT12-15 27.55 27.55 27.55 ZT16-19 48.5 48.5 48.5 ZT20-23 61.55 61.55 61.55