condition mean min max ZT0-3 15.350000000000001 15.350000000000001 15.350000000000001 ZT4-7 14.9 14.9 14.9 ZT8-11 10.100000000000001 10.100000000000001 10.100000000000001 ZT12-15 8.95 8.95 8.95 ZT16-19 10.850000000000001 10.850000000000001 10.850000000000001 ZT20-23 11.0 11.0 11.0