condition mean min max ZT0-3 52.1 52.1 52.1 ZT4-7 34.4 34.4 34.4 ZT8-11 48.0 48.0 48.0 ZT12-15 34.5 34.5 34.5 ZT16-19 31.25 31.25 31.25 ZT20-23 42.25 42.25 42.25