condition mean min max ZT0-3 39.1 39.1 39.1 ZT4-7 22.4 22.4 22.4 ZT8-11 31.0 31.0 31.0 ZT12-15 64.4 64.4 64.4 ZT16-19 42.5 42.5 42.5 ZT20-23 38.3 38.3 38.3