This standardized approach allows for comparisons among states and for optimal use of the data for single-state or multistate analysis. The standardized data collection methodology is prescribed in the CDC Model Surveillance Protocol. For example, the basic methodology calls for two mailings of the questionnaire packet.
States have the option to adopt an additional third mailing.
The primary data collection method is by a mailed questionnaire with multiple follow-up attempts being made to nonrespondents by mail and then by telephone. A key aspect of his approach is to make numerous and varied contacts with sampled mothers. Initial Mail Questionnaire Packet. Its contents are described below. Second Mail Questionnaire Packet.