condition mean min max ZT0-3 157.359169 157.359169 157.359169 ZT4-7 103.243731 103.243731 103.243731 ZT8-11 151.57442550000002 151.57442550000002 151.57442550000002 ZT12-15 159.00663500000002 159.00663500000002 159.00663500000002 ZT16-19 237.569236 237.569236 237.569236 ZT20-23 220.36202500000002 220.36202500000002 220.36202500000002