condition mean min max ZT0-3 135.346722 135.346722 135.346722 ZT4-7 132.0407615 132.0407615 132.0407615 ZT8-11 101.661115 101.661115 101.661115 ZT12-15 61.6000335 61.6000335 61.6000335 ZT16-19 129.2298155 129.2298155 129.2298155 ZT20-23 217.5618175 217.5618175 217.5618175