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Table 3 Characteristics of cohort participants who completed at least one surveillance report and among these surveillance participants, the percentage of weekly reports completed

From: Factors associated with recruitment, surveillance participation, and retention in an observational study of pregnant women and influenza

 

Cohort Enrollees (Year 1)

Completed One or More Surveillance Reports

Among Surveillance Participants, Percentage (95% CI) of Weeks with Completed Reports a

N (Col. %)

N (Row %)

p-value b

 

p-value c

Total N

1374 (100)

1106 (80)

 

55 (53–56)

 

Medical Record Variables

 Study Site

  

p < .0005

 

p < .0005

  Site 1

565 (41)

503 (89)

 

63 (61–65)

 

  Site 2

809 (59)

603 (75)

 

47 (46–49)

 

 Race (White)

  

p < .0005

 

p < .0005

  White

934 (68)

785 (84)

 

57 (56–59)

 

  Non-White

440 (32)

321 (73)

 

48 (45–50)

 

 Ethnicity

  

p < .0005

 

p < .0005

  Hispanic/Latina

173 (13)

122 (71)

 

48 (44–52)

 

  Non-Hispanic

1201 (87)

984 (82)

 

55 (54–57)

 

 High Risk Medical Conditions

  Chronic Condition (prior to pregnancy)

277 (20)

228 (82)

p = .39

57 (54–60)

p = .08

   No condition

1097 (80)

878 (80)

 

54 (52–56)

 

  Pregnancy Complication

1034 (75)

830 (80)

p = .72

54 (53–56)

p = .50

   No complication

340 (25)

276 (81)

 

55 (53–58)

 

 Medical visits for ARI (1 or more)

  Year Prior to Study (12 months)

320 (23)

255 (80)

p = .68

55 (53–56)

p = .69

   No visit

1054 (77)

851 (81)

 

55 (53–56)

 

  Study Period (6 months)

307 (22)

234 (76)

p = .03

55 (53–56)

p = .76

   No visit

1067 (78)

872 (82)

 

55 (53–56)

 

 Study Season’s Influenza Vaccine (received)

1038 (76)

847 (82)

p = .07

55 (52–58)

p = .88

  Not received

336 (24)

259 (77)

 

55 (53–56)

 

Interview variables, N (Col. %)

 Woman’s Age (at start of season), Years d

  

p = .04

 

p = .04

   < 25

112 (8)

93 (83)

 

49 (44–54)

 

  25–29

317 (23)

261 (82)

 

55 (52–58)

 

  30–34

558 (41)

459 (82)

 

56 (54–58)

 

   ≥ 35

387 (28)

293 (76)

 

54 (51–56)

 

 Gestational Age (at start of season), Days d

  

p < .0005

 

p < .0005

   < 137

339 (25)

306 (90)

 

65 (53–67)

 

  137–172

363 (26)

283 (78)

 

56 (54–59)

 

  173–224

356 (26)

301 (85)

 

53 (51–55)

 

   ≥ 225

316 (23)

216 (68)

 

40 (37–43)

 

 Race (Self-Reported)

  

p < .0005

 

p < .0005

  White

934 (68)

785 (84)

 

57 (56–59)

 

  Asian

205 (15)

154 (75)

 

52 (48–55)

 

  Black

64 (5)

40 (63)

 

44 (37–51)

 

  Mixed or Other

171 (12)

127 (74)

 

44 (40–48)

 

 Marital Status

  

p = .61

 

p = .003

  Married or Partnered

1286 (94)

1037 (81)

 

55 (54–57)

 

  Not Married and Not Partnered

88 (6)

69 (78)

 

47 (41–52)

 

 Education

  

p = .14

 

p = .08

  High school or less

119 (9)

92 (77)

 

50 (42–54)

 

  Some college or bachelor’s degree

744 (54)

589 (79)

 

55 (53–57)

 

  Advanced degree

511 (37)

425 (83)

 

55 (53–57)

 

 Subjective social status

  

p = .23

 

p = .77

  1 to 3 (low)

25 (2)

20 (80)

 

51 (41–61)

 

  4 to 6 (medium)

697 (51)

555 (80)

 

55 (53–57)

 

  7 to 9 (high)

632 (46)

518 (82)

 

54 (52–56)

 

  Missing or refused

20 (1)

13 (65)

 

57 (43–71)

 

 Child(ren) aged < 13 years at home

  

p < .0005

 

p = .001

  No

644 (47)

549 (85)

 

57 (55–59)

 

  Yes child

730 (53)

557 (76)

 

52 (51–54)

 

 Self-rated Health Status

  

p = .11

 

p = .24

  Poor, fair, or good

301 (22)

234 (78)

 

52 (49–55)

 

  Very good

548 (40)

435 (79)

 

55 (53–57)

 

  Excellent

525 (38)

437 (83)

 

55 (53–54)

 

 Smoking

  

p = .34

 

p = .68

  Never smoked

1016 (74)

824 (81)

 

55 (53–56)

 

  Previously or currently smoke

358 (26)

282 (79)

 

54 (51–57)

 

 Stressful events in past year (number)

  

p = .11

 

p = .001

  0

276 (20)

231 (84)

 

55 (54–58)

 

  1

349 (25)

290 (83)

 

56 (54–59)

 

  2

310 (23)

243 (78)

 

57 (55–60)

 

  3 or more

439 (32)

342 (78)

 

51 (48–53)

 
  1. Abbreviations: CI Confidence interval, ARI Acute respiratory illness
  2. aSince some women had delivery dates during the surveillance period, women differ in the number of eligible surveillance weeks; we report the percentage of eligible surveillance weeks when at least one surveillance report was completed
  3. bp-value is from Chi-square test of difference between groups in percentage completing at least one surveillance
  4. cp-value is from Student’s t-test or F-ratio comparing the mean percentage of weeks when surveillance was completed between groups
  5. dWomen’s age and age of fetus were calculated using a common reference date, which was the start of the influenza season at each study site; gestational age is reported in quartiles
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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