condition mean min max ZT0-3 7.7752775 7.004569999999999 8.545985 ZT4-7 5.174295000000001 5.174295000000001 5.174295000000001 ZT8-11 13.8667 13.8667 13.8667 ZT12-15 0 0 0 ZT16-19 14.0488 14.0488 14.0488 ZT20-23 9.829725 9.829725 9.829725