condition mean min max ZT0-3 0.6795275672500001 0.39936918200000004 0.9596859525000001 ZT4-7 1.9273045460000002 1.402958696 2.4516503960000002 ZT8-11 4.0024257605 3.2650771585 4.7397743625 ZT12-15 9.6334883175 7.826055114999999 11.44092152 ZT16-19 11.4953806975 10.903455905000001 12.08730549 ZT20-23 12.6627998515 11.817182908 13.508416795