condition mean min max ZT0-3 24.200000000000003 24.200000000000003 24.200000000000003 ZT4-7 34.0 34.0 34.0 ZT8-11 50.0 50.0 50.0 ZT12-15 16.7 16.7 16.7 ZT16-19 38.2 38.2 38.2 ZT20-23 29.950000000000003 29.950000000000003 29.950000000000003