condition mean min max ZT0-3 14.55 14.55 14.55 ZT4-7 5.8 5.8 5.8 ZT8-11 14.3 14.3 14.3 ZT12-15 13.7 13.7 13.7 ZT16-19 10.3 10.3 10.3 ZT20-23 11.3 11.3 11.3