condition mean min max ZT0-3 38.1 38.1 38.1 ZT4-7 43.5 43.5 43.5 ZT8-11 21.1 21.1 21.1 ZT12-15 26.5 26.5 26.5 ZT16-19 35.4 35.4 35.4 ZT20-23 20.45 20.45 20.45