condition mean min max ZT0-3 39.5 39.5 39.5 ZT4-7 19.6 19.6 19.6 ZT8-11 29.7 29.7 29.7 ZT12-15 38.1 38.1 38.1 ZT16-19 17.9 17.9 17.9 ZT20-23 43.45 43.45 43.45