condition mean min max ZT0-3 0.4635843333333334 0.2689145 0.6602995 ZT4-7 0.2857705 0.2857705 0.2857705 ZT8-11 0.1601845 0.1601845 0.1601845 ZT12-15 0.249133 0.22231250000000002 0.27595349999999996 ZT16-19 0.37905350000000004 0.37905350000000004 0.37905350000000004 ZT20-23 0.20080900000000002 0.20080900000000002 0.20080900000000002