condition mean min max ZT0-3 7.65 7.65 7.65 ZT4-7 10.4 10.4 10.4 ZT8-11 9.850000000000001 9.850000000000001 9.850000000000001 ZT12-15 9.15 9.15 9.15 ZT16-19 6.0 6.0 6.0 ZT20-23 8.0 8.0 8.0