condition mean min max ZT0-3 24.9 24.9 24.9 ZT4-7 14.6 14.6 14.6 ZT8-11 38.85 38.85 38.85 ZT12-15 10.55 10.55 10.55 ZT16-19 21.6 21.6 21.6 ZT20-23 23.55 23.55 23.55