Table 6 Interactive effect of age in patients with stroke in two CHARLS databases
Subgroups | Sleeptime, hours | with stroke | P for interaction | with stroke | P for interaction | ||
|---|---|---|---|---|---|---|---|
Crude OR_95CI% | Crude P value | Adjusted OR_95CI % | Adjusted P value | ||||
Age in 2018 (years) |  |  |  |  < 0.001 |  |  | 0.561 |
 < 60 |  < 7 | 1(Ref) |  |  | 1(Ref) |  |  |
|  | 7–9 | 0.942(0.508,1.749) | 0.851 |  | 0.936(0.493,1.775) | 0.839 |  |
|  |  > 9 | 1.392(0.822,2.357) | 0.219 |  | 1.485(0.767,2.872) | 0.241 |  |
P-trend | Â | 0.90 (0.816,0.982) | 0.019 | Â | 0.892 (0.799,0.996) | 0.044 | Â |
 ≥ 60 |  < 7 | 1(Ref) |  |  | 1(Ref) |  |  |
|  | 7–9 | 0.694(0.511,0.943) | 0.019 |  | 0.691(0.503,0.95) | 0.023 |  |
|  |  > 9 | 1.239(1.06,1.447) | 0.007 |  | 1.342(1.132,1.59) | 0.001 |  |
P-trend | Â | 0.974(0.940,1.011) | 0.164 | Â | 0.979 (0.937.1.024) | 0.362 | Â |
Age in 2020 (years) |  |  |  |  < 0.001 |  |  | 0.050 |
 < 60 |  < 7 | 1(Ref) |  |  | 1(Ref) |  |  |
|  | 7–9 | 1.857(0.604,5.709) | 0.280 |  | 2.401(0.694,8.298) | 0.166 |  |
|  |  > 9 | 0.448(0.087,2.322) | 0.339 |  | 0.371(0.054,2.537) | 0.312 |  |
P-trend | Â | 0.851(0.726,0.998) | 0.030 | Â | 0.877(0.7327,1.050) | 0.152 | Â |
 ≥ 60 |  < 7 | 1(Ref) |  |  | 1(Ref) |  |  |
|  | 7–9 | 1.258(0.763,2.076) | 0.368 |  | 1.105(0.644,1.896) | 0.717 |  |
|  |  > 9 | 1.186(0.868,1.62) | 0.284 |  | 1.27(0.894,1.805) | 0.182 |  |
P-trend | Â | 0.927(0.873,0.984) | 0.012 | Â | 0.931(0.868,0.999) | 0.046 | Â |