Table 2 Valid observation subjects through PSM and balance between subjects in matched samples
Variables | Before PSM | Standardized difference (%) | P | Variables | After PSM | Standardized difference (%) | P | ||
|---|---|---|---|---|---|---|---|---|---|
Intervention group (n = 2083) | Control group (n = 3152) | Intervention group (n = 1673) | Control group (n = 1673) | ||||||
Sex (male, %) | 49.1 | 51.9 | −5.6 | 0.048 | Sex (male, %) | 52.4 | 51.7 | 1.4 | 0.678 |
Age (year) | 66.4 ± 7.9 | 62.9 ± 11.4 | 35.7 | 0.021 | Age (year) | 65.0 ± 5.1 | 64.5 ± 7.3 | 7.9 | 0.307 |
Annual income (yuan) | 12,901 ± 20,705 | 13,865 ± 19,244 | −4.8 | 0.143 | Annual income (yuan) | 12,805 ± 14,429 | 12,863 ± 12,050 | −0.4 | 0.992 |
Diastolic pressure (mmHg) | 115.6 ± 33.2 | 111.9 ± 39.0 | 10.2 | 0.039 | Diastolic pressure (mmHg) | 114.9 ± 29.7 | 112.6 ± 34.6 | 7.1 | 0.420 |
Systolic pressure (mmHg) | 198.0 ± 65.7 | 201.1 ± 68.2 | −4.6 | 0.122 | Systolic pressure (mmHg) | 197.5 ± 39.5 | 197.2 ± 30.1 | 0.9 | 0.855 |