condition mean min max ZT0-3 41.35 41.35 41.35 ZT4-7 39.0 39.0 39.0 ZT8-11 24.8 24.8 24.8 ZT12-15 39.65 39.65 39.65 ZT16-19 52.650000000000006 52.650000000000006 52.650000000000006 ZT20-23 43.849999999999994 43.849999999999994 43.849999999999994