condition mean min max ZT0-3 43.050000000000004 43.050000000000004 43.050000000000004 ZT4-7 12.0 12.0 12.0 ZT8-11 11.15 11.15 11.15 ZT12-15 24.200000000000003 24.200000000000003 24.200000000000003 ZT16-19 9.5 9.5 9.5 ZT20-23 8.7 8.7 8.7