condition mean min max ZT0-3 10.45 10.45 10.45 ZT4-7 31.1 31.1 31.1 ZT8-11 16.6 16.6 16.6 ZT12-15 9.95 9.95 9.95 ZT16-19 5.0 5.0 5.0 ZT20-23 29.55 29.55 29.55