Table 1
Sex and rural–urban divide of reported cases of human brucellosis by age group, in Nahavand county (2010–2017)
| Age group Frequency (%) | 0–14 y n (%) | 15–24 y n (%) | 25–44 y n (%) | 45–54 y n (%) | 55+ y n (%) | P | |
|---|---|---|---|---|---|---|---|
| Sex | Male 668 (60.9%) | 98 (14.2) | 123 (17.9) | 274 (39.8) | 86 (12.5) | 107 (15.6) | <0.001* |
| Female 442 (39.1%) | 42 (9.5) | 64 (14.5) | 161 (36.4) | 68 (15.4) | 107 (24.2) | ||
| Location | Rural 986 (87.3) | 125 (12.7) | 163 (16.5) | 376 (38.1) | 135 (13.7) | 187 (19.0) | 0.94 |
| Urban 144 (12.7%) | 15 (10.4) | 24 (16.7) | 59 (41.0) | 19 (13.2) | 27 (18.8) | ||
| Total | 140 (12.4) | 187 (16.6) | 435 (38.5) | 154 (13.6) | 214 (18.9) | ||
Figure 1
Radar plot showing average morbidity (%) and month of 1,130 reported cases of human brucellosis in Nahavand county, western Iran (2010–2017).
Figure 2
Occupation of 1,130 patients with reported cases of human brucellosis in Nahavand county, western Iran (2010–2017).
Table 2
Year of change point, APC, and AAPC for brucellosis incidence in Nahavand, 2010–2017
| Group | No. of change points (year) | Years | APC Mean (95% CI) | P | AAPC Mean (95% CI) | P |
|---|---|---|---|---|---|---|
| Male population | 1 (2013) | 2010–2013 | 68.5* (20.1, 136.4) | 0.016* | 17.4 (4.4, 31.9) | 0.007* |
| 2013–2017 | –10.5 (–27.8, 10.8) | 0.20 | ||||
| Female population | 1 (2013) | 2010–2013 | 42.8 (–1.3, 106.5) | 0.055 | 13.8 (0.2, 29.3) | 0.047* |
| 2013–2017 | –4.0 (–24, 21.3) | 0.62 | ||||
| Urban population | 1 (2014) | 2010–2014 | 36.2 (–2.9, 91.1) | 0.062 | 11.1 (–7.6, 33.7) | 0.26 |
| 2014–2017 | –15.3 (–50.4, 44.7) | 0.40 | ||||
| Rural population | 1 (2013) | 2010–2013 | 59.2 (10.3, 129.9) | 0.028* | 16.1 (2.2, 31.8) | 0.02* |
| 2013–2017 | –8.4 (–27.4, 15.5) | 0.31 | ||||
| Overall | 1 (2013) | 2010–2013 | 57.3 (13.6, 117.9) | 0.021* | 15.8 (3.5, 29.6) | 0.01* |
| 2013–2017 | –8.0 (–25.1, 13.1) | 0.23 |
Figure 3
Trend and annual percent change (APC) for brucellosis incidence in Nahavand county, western Iran (2010–2017). Incidence is shown per 100,000 population (solid circles indicated observed values). (A) Male population, dark gray line 2010–2013 APC 68.5*, light gray line 2013–2017, APC –10.5; (B) female population, dark gray line 2010–2013 APC 42.8, light gray line –4; (C) urban population, dark gray line 2010–2014 APC 36.2, light gray line –15.3; (D) rural population, dark gray line 2010–2013 APC 59.2*, light gray line 2013–2017 –8.4 (see Table 2). *P < 0.05. Joinpoint Regression Program (version 4.7.0.0, Feb 2020; Statistical Methodology and Applications Branch, Surveillance Research Program, National Cancer Institute).