Is the increased incidence of pathologically proven acute appendicitis more likely seen in elderly patients? A retrospective cohort study

Figures & data

Figure 1. Flow diagram of the study population.

Figure 2. Line graph showing mean age (year) with 95% confidence interval of the patients throughout the study years between 2007 and 2016, by year. The numbers 1 to 10 indicates the years 2007 to 2016, respectively.

Figure 3. Correlation between mean age of the patients (line y:mean_age) and the study years (line x: no_of_years). The numbers 1 to 10 in line × indicates the years 2007 to 2016, respectively.

Figure 4. Correlation between the percent value of the older patients (≥60 years) (line y:percent_older_patients) and the study years (line x: no_of_years). The numbers 1 to 10 in line × indicates the years 2007 to 2016, respectively.

Table 1. Demographic variables of the patients with final pathological diagnosis of acute appendicitis (n = 3296) based on an annual base.

Year	N	% of male patients	Age (mean ± SD)	% of older patients (≥60 years)
2007	215	0.70	29.3 ± 10.4	0.93
2008	270	0.63	28.3 ± 9.9	1.11
2009	261	0.73	30.0 ± 10.8	1.15
2010	366	0.65	30.7 ± 11.8	2.73
2011	336	0.73	30.9 ± 13.2	4.76
2012	381	0.72	30.9 ± 12.7	3.15
2013	340	0.65	30.7 ± 12.0	2.94
2014	351	0.72	30.0 ± 11.7	2.56
2015	379	0.60	30.8 ± 12.6	3.43
2016	397	0.66	31.5 ± 12.8	4.28
p	0.004	0.636	0.043	0.019