Table 1.

Selected demographic and behavior variables for genital HPV infection among men from rural China included in the prevalence analysis, included in the incidence analysis, and not included in the incidence analysis, 2009–2013

Participants included in the prevalence analysisaParticipants included in the incidence analysisbParticipants not included in the incidence analysis
Variablen (%)n (%)n (%)Pc
N = 1,279N = 1,059N = 220
Follow-up time (mo)
 Median (IQR)25.3 (7.6–37.2)31.8 (15.4–37.9)
 Mean (SD)22.4 (14.9)27.0 (11.8)
Age at enrollment (y)
 Median (IQR)43 (36–54)44 (37–55)36 (29.5–43)
 25–50888 (69.4)697 (65.8)191 (86.8)
 51–65391 (30.6)362 (34.2)29 (13.2)<0.001
Marital status
 Not married66 (5.2)56 (5.3)10 (4.6)
 Married1,213 (94.8)1,003 (94.7)210 (95.4)0.651
Type of job
 Farming486 (38.0)441 (41.6)45 (20.5)
 Work in local area374 (29.2)301 (28.4)73 (33.2)
 Work outside419 (32.8)317 (30.0)138 (46.3)<0.001
Education level
 Primary school or below384 (30.0)335 (31.6)49 (22.3)
 Junior middle School690 (53.9)570 (53.8)120 (54.5)
 Senior middle school or above157 (12.3)121 (11.4)36 (16.3)
 Unknownd48 (3.8)33 (3.1)15 (6.8)0.001
No. of lifetime sexual partners
 0–11,120 (87.6)934 (88.2)186 (84.6)
 ≥2159 (12.4)125 (11.8)34 (15.4)0.135
Current smoker
 No561 (43.9)463 (43.7)98 (44.6)
 Yes718 (56.1)596 (56.3)122 (55.4)0.823
Bath frequency in winter (d)
 1–7459 (35.9)354 (33.4)105 (47.7)
 8–30630 (49.3)531 (50.1)99 (45.0)
 >30190 (14.8)174 (16.5)16 (7.3)<0.001
Wash genitalia before sex
 No990 (77.4)839 (79.2)151 (68.6)
 Yes289 (22.6)220 (20.8)69 (31.4)0.001

Abbreviations: IQR, interquartile range; SD, standard deviation.

  • aParticipants having valid HPV results for at least one visit were included in the prevalence analysis.

  • bParticipants having valid HPV results for at least two consecutive visits were included in the incidence analysis.

  • cχ2 test was used to compare between participants included in the incidence analysis and not included.

  • dThe unknown category was not included in the χ2 test.