condition mean min max ZT0-3 515.899294 515.899294 515.899294 ZT4-7 681.6194595 681.6194595 681.6194595 ZT8-11 323.5058005 323.5058005 323.5058005 ZT12-15 121.326345 121.326345 121.326345 ZT16-19 59.570566 59.570566 59.570566 ZT20-23 97.534475 97.534475 97.534475