condition mean min max ZT0-3 417.609928 417.609928 417.609928 ZT4-7 474.9817365 474.9817365 474.9817365 ZT8-11 489.445944 489.445944 489.445944 ZT12-15 581.6689054999999 581.6689054999999 581.6689054999999 ZT16-19 468.244719 468.244719 468.244719 ZT20-23 565.7016695 565.7016695 565.7016695