condition mean min max ZT0-3 3.850668799 2.825090561 4.876247037 ZT4-7 8.2427581355 7.133352717499999 9.3521635535 ZT8-11 10.69589090525 9.4048773255 11.986904485 ZT12-15 6.430601355 5.6865115365 7.174691173499999 ZT16-19 4.732418203999999 4.639368601499999 4.825467806499999 ZT20-23 3.5452720985 2.9239248460000002 4.166619351