condition mean min max ZT0-3 32.35 32.35 32.35 ZT4-7 7.4 7.4 7.4 ZT8-11 7.65 7.65 7.65 ZT12-15 16.4 16.4 16.4 ZT16-19 10.2 10.2 10.2 ZT20-23 19.55 19.55 19.55