condition mean min max ZT0-3 16.486733 16.486733 16.486733 ZT4-7 8.216901499999999 8.216901499999999 8.216901499999999 ZT8-11 8.068343500000001 8.068343500000001 8.068343500000001 ZT12-15 24.323621 24.323621 24.323621 ZT16-19 11.484226 11.484226 11.484226 ZT20-23 37.7925795 37.7925795 37.7925795