Measures of additive interaction for sex and food security status in association with perceived poor or fair mental health, overall and stratified by age group
| Exposure category | Additive interaction measure (95% CI) | ||
|---|---|---|---|
| RERI | AP | Synergy index | |
| Overall | |||
| Severe food insecurity female v. male sex | 1.07 (0.24 to 1.89) | 0.21 (0.06 to 0.36) | 1.36 (1.06 to 1.74) |
| Moderate food insecurity female v. male sex | 0.05 (−0.57 to 0.68) | 0.02 (−0.20 to 0.23) | 1.03 (0.74 to 1.44) |
| Age, yr | |||
| 18–39 | |||
| Severe food insecurity female v. male sex | 0.97 (−0.38 to 2.33) | 0.18 (−0.05 to 0.40) | 1.27 (0.90 to 1.79) |
| Moderate food insecurity female v. male sex | 0.95 (0.02 to 1.87) | 0.27 (0.04 to 0.51) | 1.62 (0.97 to 2.70) |
| 40–64 | |||
| Severe food insecurity female v. male sex | 1.38 (0.29 to 2.47) | 0.28 (0.09 to 0.47) | 1.54 (1.07 to 2.21) |
| Moderate food insecurity female v. male sex | −0.72 (−1.65 to 0.22) | −0.28 (−0.68 to 0.12) | 0.68 (0.42 to 1.11) |
| ≥ 65 | |||
| Severe food insecurity female v. male sex | −2.7 (−6.93 to 1.40) | −0.93 (−2.70 to 0.84) | 0.42 (0.12 to 1.47) |
| Moderate food insecurity female v. male sex | −1.60 (−4.18 to 0.98) | −0.75 (−2.18 to 0.68) | 0.41 (0.11 to 1.55) |
Note: AP = attributable portion due to interaction, CI = confidence interval, RERI = relative excess risk due to interaction.