condition mean min max ZT0-3 49.15 49.15 49.15 ZT4-7 16.1 16.1 16.1 ZT8-11 8.6 8.6 8.6 ZT12-15 22.3 22.3 22.3 ZT16-19 5.5 5.5 5.5 ZT20-23 16.6 16.6 16.6