condition mean min max ZT0-3 22.45 22.45 22.45 ZT4-7 23.4 23.4 23.4 ZT8-11 24.0 24.0 24.0 ZT12-15 30.85 30.85 30.85 ZT16-19 48.849999999999994 48.849999999999994 48.849999999999994 ZT20-23 32.6 32.6 32.6