condition mean min max ZT0-3 9.15 9.15 9.15 ZT4-7 7.7 7.7 7.7 ZT8-11 29.1 29.1 29.1 ZT12-15 9.55 9.55 9.55 ZT16-19 6.6 6.6 6.6 ZT20-23 6.8 6.8 6.8