Number of studies and comparisons reporting on the presence or absence of differential effectiveness and effectiveness ratios for each outcome
| Less effective for lower SEP | Equally effective | More effective for lower SEP | ||
| Physical activity (n=7, k=32) | Qualitative information | (n=6, k=27)20–25 | (n=1, k=1)24 | |
| Quantitative information | (n=2, k=4), ratio 0.65:2.1921 26 | n/a | ||
| Smoking cessation (n=6, k=16) | Qualitative information | (n=2, k=9)20 29 | n/a | |
| Quantitative information | (n=4, k=6), ratio 0.74:3.0426–28 30 | (n=1, k=1), ratio 3.3630 | ||
| Nutrition (n=6, k=19) | Qualitative information | (n=5, k=13)21–23 27 28 | n/a | |
| Quantitative information | (n=1, k=3), ratio 0.54:0.8826 | (n=2, k=3), ratio 2.18:3.3521 27 | ||
| BMI/body weight (n=5, k=8) | Qualitative information | (n=3, k=5)22 23 32 | (n=1, k=2)24 | |
| Quantitative information | n/a | (n=1, k=1), ratio 1.6531 | ||
| Total | Qualitative information | (n=10, k=54)20–25 27–29 32 | (n=1, k=3)24 | |
| Quantitative information | (n=5, k=13), ratio 0.54:3.0421 26–28 30 | (n=4, k=5), ratio 1.65:3.3621 27 30 31 |
The sum of studies is higher than 13 because some studies test multiple comparisons of differential effectiveness with different results.
BMI, body mass index; k, number of comparisons; n, number of studies; n/a, not available; SEP, socioeconomic position.