condition mean min max ZT0-3 15.4 15.4 15.4 ZT4-7 22.2 22.2 22.2 ZT8-11 38.55 38.55 38.55 ZT12-15 31.15 31.15 31.15 ZT16-19 44.4 44.4 44.4 ZT20-23 20.9 20.9 20.9