condition mean min max ZT0-3 10.850000000000001 10.850000000000001 10.850000000000001 ZT4-7 7.1 7.1 7.1 ZT8-11 8.350000000000001 8.350000000000001 8.350000000000001 ZT12-15 8.55 8.55 8.55 ZT16-19 14.1 14.1 14.1 ZT20-23 8.25 8.25 8.25