condition mean min max ZT0-3 10.7 10.7 10.7 ZT4-7 19.7 19.7 19.7 ZT8-11 18.3 18.3 18.3 ZT12-15 18.35 18.35 18.35 ZT16-19 9.7 9.7 9.7 ZT20-23 20.15 20.15 20.15