condition mean min max ZT0-3 31.4 31.4 31.4 ZT4-7 30.1 30.1 30.1 ZT8-11 38.1 38.1 38.1 ZT12-15 21.9 21.9 21.9 ZT16-19 19.1 19.1 19.1 ZT20-23 29.3 29.3 29.3