condition mean min max ZT0-3 47.05 47.05 47.05 ZT4-7 11.9 11.9 11.9 ZT8-11 22.35 22.35 22.35 ZT12-15 53.900000000000006 53.900000000000006 53.900000000000006 ZT16-19 46.7 46.7 46.7 ZT20-23 51.3 51.3 51.3