Table 4.
Significance tests for interactions between personal income and several covariates.
| Experimenter | Weekly smoker | Daily smoker | Smoking intensity | |||||
|---|---|---|---|---|---|---|---|---|
| χ2 | P‐value | χ2 | P‐value | χ2 | P‐value | χ2 | P‐value | |
| Age (years) | ||||||||
| 16 | 1.30 | 0.86 | 4.78 | 0.31 | 3.28 | 0.51 | 2.27 | 0.69 |
| 17 | 4.57 | 0.33 | 3.50 | 0.48 | 1.39 | 0.85 | 6.01 | 0.20 |
| Sex | 4.62 | 0.33 | 8.37 | 0.08 | 2.62 | 0.62 | 2.92 | 0.57 |
| Subjective social status (SSS) | 7.28 | 0.51 | 9.74 | 0.28 | 13.06 | 0.11 | 18.60 | 0.02 |
| Family affluence scale (FAS) | 10.29 | 0.24 | 9.65 | 0.29 | 11.51 | 0.17 | 4.26 | 0.83 |
| Low education father | 2.42 | 0.66 | 5.00 | 0.29 | 4.00 | 0.41 | 11.68 | 0.02 |
| Low education mother | 2.24 | 0.69 | 1.99 | 0.73 | 0.47 | 0.98 | 4.83 | 0.31 |
| Countries | 10.48 | 0.79 | 18.87 | 0.22 | 18.51 | 0.24 | 21.98 | 0.11 |
| Cigarette buyer | – | – | – | – | – | – | 3.63 | 0.46 |
SSS = Subjective Social Status; FAS = Family Affluence Scale. Significant values for a 95% threshold are shown in bold type.