condition mean min max ZT0-3 20.200000000000003 20.200000000000003 20.200000000000003 ZT4-7 29.0 29.0 29.0 ZT8-11 40.6 40.6 40.6 ZT12-15 45.849999999999994 45.849999999999994 45.849999999999994 ZT16-19 25.2 25.2 25.2 ZT20-23 34.5 34.5 34.5