condition mean min max ZT0-3 3.33495 3.33495 3.33495 ZT4-7 1.884725 1.884725 1.884725 ZT8-11 11.69185 11.69185 11.69185 ZT12-15 11.157060000000001 11.157060000000001 11.157060000000001 ZT16-19 9.906285 9.906285 9.906285 ZT20-23 3.79185 3.79185 3.79185