condition mean min max ZT0-3 0.22945349999999998 0.22945349999999998 0.22945349999999998 ZT4-7 0.33641350000000003 0.33641350000000003 0.33641350000000003 ZT8-11 0.1791035 0.1791035 0.1791035 ZT12-15 0.393645 0.393645 0.393645 ZT16-19 0.126849 0.126849 0.126849 ZT20-23 0.280584 0.280584 0.280584