National Survey of Children’s Health Questionnaires, Datasets, and Supporting Documents

2019

Questionnaires

2018

Questionnaires

Supporting Documents

2017

Questionnaires

Supporting Documents

2016

Questionnaires

Supporting Documents

A Note on Sample Size and Comparisons Across Years

In both individual year and multi-year analyses, the NSCH sample size may be limited for smaller populations (e.g., American Indian (AI) /Alaska Native (AN)) and state-level subgroups or rare outcomes (e.g., adolescent children with special health care needs (CSHCN) or autism in a particular state).

Small sample sizes may produce unstable estimates.

To minimize misinterpretation, we recommend only presenting statistics with a sample size or unweighted denominator of 30 or more.

Further, if the 95% confidence interval width exceeds 20 percentage points or 1.2 times the estimate (≈ relative standard error>30%), we recommend flagging for poor reliability and/or presenting a measure of statistical reliability (e.g., confidence intervals or statistical significance testing) to promote appropriate interpretation.

Additionally, comparisons across years should generally be based on non-overlapping estimates (e.g., 2016 versus 2017 or 2017-2018 NOT 2016-2017 versus 2017-2018). Changes over time should be evaluated for statistical significance and ideally sustained over multiple assessments to confirm a change versus a single fluctuation or random error (Type 1). For more information, please see the multi-year analysis guide. (PDF - 232 KB)

Date Last Reviewed:  January 2020