Table 3.
Average TCC by Question Topic, YRBS, 2000, United States
| Question Topic | Average TCCa | SE | P Value |
| Sexual intercourse | 0.950 | 0.064 | ≤0.1 |
| Tobacco | 0.913 | 0.033 | ≤0.01 |
| Alcohol | 0.892 | 0.044 | |
| Illegal drugs | 0.882 | 0.031 | ≤0.1 |
| Weight control | 0.740 | 0.038 | ≤0.1 |
| All questions | 0.817 | 0.016 |
Abbreviations: SE, standard error multiplier; TCC, tetrachoric correlation; YRBS, Youth Risk Behavior Survey.
a
TCC measures agreement between wave 1 and wave 2 responses, with 0.0 representing chance agreement and 1.0 perfect agreement. Averages were found in linear regression. R2 = 0.32.