Final answer:
The statement '6-18 months boys affected twice as often as girls' implies that there is a difference in the occurrence of a certain condition or disorder between boys and girls within the age range of 6 to 18 months.
Step-by-step explanation:
In this context, the statement '6-18 months boys affected twice as often as girls' refers to the prevalence of a certain condition or disorder affecting boys compared to girls within the age range of 6 to 18 months.
It is not possible to determine the exact condition or disorder without more information, but the statement suggests a gender difference in the occurrence of the condition during this age period. Factors such as genetics, hormonal differences, or environmental factors may contribute to this disparity.
Further research or consultation with a healthcare professional would be necessary to understand the specific condition in question.