condition mean min max ZT0-3 14.1 14.1 14.1 ZT4-7 36.7 36.7 36.7 ZT8-11 10.45 10.45 10.45 ZT12-15 8.9 8.9 8.9 ZT16-19 30.0 30.0 30.0 ZT20-23 9.65 9.65 9.65