condition mean min max ZT0-3 61.85 61.85 61.85 ZT4-7 20.1 20.1 20.1 ZT8-11 38.650000000000006 38.650000000000006 38.650000000000006 ZT12-15 28.1 28.1 28.1 ZT16-19 60.849999999999994 60.849999999999994 60.849999999999994 ZT20-23 29.450000000000003 29.450000000000003 29.450000000000003