condition mean min max ZT0-3 54.2 54.2 54.2 ZT4-7 39.6 39.6 39.6 ZT8-11 44.900000000000006 44.900000000000006 44.900000000000006 ZT12-15 51.55 51.55 51.55 ZT16-19 52.9 52.9 52.9 ZT20-23 26.05 26.05 26.05