condition mean min max ZT0-3 10.05 10.05 10.05 ZT4-7 7.7 7.7 7.7 ZT8-11 9.7 9.7 9.7 ZT12-15 16.7 16.7 16.7 ZT16-19 22.0 22.0 22.0 ZT20-23 17.3 17.3 17.3