condition mean min max ZT0-3 14.228 12.91705 15.53895 ZT4-7 7.84615 7.84615 7.84615 ZT8-11 8.514085 8.514085 8.514085 ZT12-15 0 0 0 ZT16-19 18.03605 18.03605 18.03605 ZT20-23 10.593765000000001 10.593765000000001 10.593765000000001