condition mean min max ZT0-3 30.5 30.5 30.5 ZT4-7 45.4 45.4 45.4 ZT8-11 43.25 43.25 43.25 ZT12-15 56.7 56.7 56.7 ZT16-19 39.1 39.1 39.1 ZT20-23 20.55 20.55 20.55