condition mean min max ZT0-3 54.650000000000006 54.650000000000006 54.650000000000006 ZT4-7 56.6 56.6 56.6 ZT8-11 47.55 47.55 47.55 ZT12-15 49.6 49.6 49.6 ZT16-19 39.0 39.0 39.0 ZT20-23 52.15 52.15 52.15