condition mean min max ZT0-3 30.7 30.7 30.7 ZT4-7 76.5 76.5 76.5 ZT8-11 61.55 61.55 61.55 ZT12-15 85.6 85.6 85.6 ZT16-19 18.6 18.6 18.6 ZT20-23 60.3 60.3 60.3