condition mean min max ZT0-3 25.450000000000003 25.450000000000003 25.450000000000003 ZT4-7 8.4 8.4 8.4 ZT8-11 18.4 18.4 18.4 ZT12-15 38.0 38.0 38.0 ZT16-19 30.5 30.5 30.5 ZT20-23 37.8 37.8 37.8