condition mean min max ZT0-3 12.1 12.1 12.1 ZT4-7 9.6 9.6 9.6 ZT8-11 17.1 17.1 17.1 ZT12-15 32.15 32.15 32.15 ZT16-19 20.6 20.6 20.6 ZT20-23 7.85 7.85 7.85