condition mean min max ZT0-3 10.0 10.0 10.0 ZT4-7 11.2 11.2 11.2 ZT8-11 11.100000000000001 11.100000000000001 11.100000000000001 ZT12-15 7.75 7.75 7.75 ZT16-19 15.45 15.45 15.45 ZT20-23 42.900000000000006 42.900000000000006 42.900000000000006