condition mean min max ZT0-3 11.1 11.1 11.1 ZT4-7 10.5 10.5 10.5 ZT8-11 13.15 13.15 13.15 ZT12-15 37.8 37.8 37.8 ZT16-19 39.5 39.5 39.5 ZT20-23 17.2 17.2 17.2