Table 1 Summary of data from the SNPR and SCB for individuals with or without an appendectomy.
Prevalence of PD in the general
population
No PD diagnosis, nPD diagnosis, nRegression
coefficient
Odds ratio
(95% CI)
P
AllAppendectomy551,003644−0.18 ± 0.050.831 (0.756–0.907)8.1 × 10−5
Controls1,144,7451608
RuralAppendectomy342,209373−0.26 ± 0.060.769 (0.681–0.867)1.5 × 10−5
Controls703,075997
UrbanAppendectomy208,794271−0.06 ± 0.070.939 (0.817–1.082)0.383
Controls441,670611
Age at PD diagnosisDiagnosis age
(years)*
Hazard ratio
(95% CI)
Appendectomy >0 years before PD
AllAppendectomy47974.93 ± 0.510.990 (0.890–1.101)0.851
Controls117674.90 ± 0.31
RuralAppendectomy27775.09 ± 0.600.989 (0.860–1.138)0.877
Controls68674.53 ± 0.41
UrbanAppendectomy20274.71 ± 0.880.965 (0.818–1.137)0.666
Controls49075.42 ± 0.47
Appendectomy ≥20 years before PD
AllAppendectomy10174.85 ± 0.810.793 (0.642–0.980)0.027
Controls65873.23 ± 0.33
RuralAppendectomy6374.09 ± 1.090.753 (0.575–0.988)0.034
Controls41772.12 ± 0.44
UrbanAppendectomy3876.12 ± 1.150.802 (0.567–1.135)0.202
Controls24175.14 ± 0.45

*Means ± SEM.