condition mean min max ZT0-3 40.8 40.8 40.8 ZT4-7 51.0 51.0 51.0 ZT8-11 44.900000000000006 44.900000000000006 44.900000000000006 ZT12-15 13.85 13.85 13.85 ZT16-19 43.0 43.0 43.0 ZT20-23 22.200000000000003 22.200000000000003 22.200000000000003