condition mean min max ZT0-3 10.1 10.1 10.1 ZT4-7 11.8 11.8 11.8 ZT8-11 15.6 15.6 15.6 ZT12-15 17.1 17.1 17.1 ZT16-19 17.05 17.05 17.05 ZT20-23 16.3 16.3 16.3