condition mean min max ZT0-3 29.9732 29.9732 29.9732 ZT4-7 39.752750000000006 39.752750000000006 39.752750000000006 ZT8-11 16.226950000000002 16.226950000000002 16.226950000000002 ZT12-15 26.8554 26.8554 26.8554 ZT16-19 25.5716 25.5716 25.5716 ZT20-23 51.0018 51.0018 51.0018