ORs for relationship between visual status and laughter (n=19 452)
| OR | 95% CI | P for trend | Adjusted OR* | 95% CI | P for trend | |
| Frequency of laughing | Almost every day | |||||
| Visual status | <0.01 | <0.01 | ||||
| Excellent | 1.99 | 1.79 to 2.21 | 1.72 | 1.54 to 1.92 | ||
| Very good | 1.38 | 1.29 to 1.47 | 1.22 | 1.14 to 1.32 | ||
| Good | 1.00 | Reference | 1.00 | Reference | ||
| Fair/poor | 0.71 | 0.63 to 0.80 | 0.86 | 0.76 to 0.98 | ||
| Number opportunities to laugh | ≥4 Opportunities to laugh | |||||
| Visual status | <0.01 | <0.01 | ||||
| Excellent | 1.45 | 1.30 to 1.62 | 1.25 | 1.11 to 1.40 | ||
| Very good | 1.27 | 1.18 to 1.37 | 1.12 | 1.04 to 1.22 | ||
| Good | 1.00 | Reference | 1.00 | Reference | ||
| Fair/poor | 0.69 | 0.60 to 0.79 | 0.87 | 0.75 to 1.01 | ||
*Adjusted for age, sex, marital status, educational attainment, equivalised household income, depressive symptoms, frequency of meeting friends, total participation score and history of systemic comorbidities.