condition mean min max ZT0-3 5.25 5.25 5.25 ZT4-7 1.4 1.4 1.4 ZT8-11 17.1 17.1 17.1 ZT12-15 12.850000000000001 12.850000000000001 12.850000000000001 ZT16-19 15.4 15.4 15.4 ZT20-23 24.8 24.8 24.8