condition mean min max ZT0-3 24.1 24.1 24.1 ZT4-7 6.8 6.8 6.8 ZT8-11 39.3 39.3 39.3 ZT12-15 54.25 54.25 54.25 ZT16-19 18.6 18.6 18.6 ZT20-23 10.7 10.7 10.7