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Table 2 Characteristics of the participants according to new vaccine delays (2–4-6 and 12 months), 2006–2016 (N = 7183)a

From: Impact of vaccine delays at the 2, 4, 6 and 12 month visits on incomplete vaccination status by 24 months of age in Quebec, Canada

 

Vaccine delays

DTaP1 (2 month visit)

DTaP2 (4 month visit)

DTaP3 (6 month visit)

Measles (12 month visit)

Frequencyb

%

P valuec

Frequencyb

%

P valuec

Frequencyb

%

P valuec

Frequencyb

%

P valuec

Dose not administered

99

  

130

  

181

  

272

  

Total vaccine delays

386/7084d

5.4%

 

941/7053d

13.3%

 

1617/7002d

23.1%

 

1634/6911d

23.6%

 

 New vaccine delays

386/386

100%

627/941

66.7%

807/1617

49.9%

986/1634

60.3%

Denominator used for the analysis

N = 7084

  

N = 6682e

  

N = 6039e

  

N = 5166e

  

Characteristics

Year of survey:

 2006

53/791

6.7%

0.003

78/738

10.6%

0.04

116/659

17.6%

0.001

149/535

27.9%

< 0.0001

 2008

67/1211

5.5%

 

104/1144

9.1%

 

138/1039

13.3%

 

229/891

25.7%

 

 2010

76/1160

6.6%

 

117/1081

10.8%

 

145/962

15.1%

 

165/804

20.5%

 

 2012

88/1381

6.4%

 

133/1286

10.3%

 

153/1149

13.3%

 

181/982

18.4%

 

 2014

58/1321

4.4%

 

109/1259

8.7%

 

132/1145

11.5%

 

140/1003

14.0%

 

 2016

44/1220

3.6%

 

86/1174

7.3%

 

123/1085

11.3%

 

122/951

12.8%

 

Sex:

 Female

188/3445

5.5%

0.98

316/3250

9.7%

0.35

404/2927

13.8%

0.34

449/2486

18.1%

0.07

 Male

198/3639

7.5%

 

311/3432

9.1%

 

403/3112

12.9%

 

537/2680

20.0%

 

Maternal age at child’s birth

  < 20 years

3/71

4.2%

0.03

6/68

8.8%

0.74

8/61

13.1%

0.49

7/52

13.5%

0.47

 20–29 years

168/3107

5.4%

 

286/2929

9.8%

 

334/2635

12.7%

 

426/2266

18.8%

 

 30–39 years

192/3685

5.2%

 

318/3487

9.1%

 

434/3163

13.7%

 

520/2701

19.3%

 

  ≥ 40 years

20/197

10.2%

 

14/177

7.9%

 

26/162

16.0%

 

31/135

23.0%

 

 Unknown / missing

3/24

12.5%

 

3 /21

14.3%

 

5/18

27.8%

 

2/13

15.4%

 

Mother’s languagef:

 French

250/4936

5.1%

0.03

400/4673

8.6%

0.004

525/4260

12.3%

0.001

655/3693

17.7%

0..04

 English

32/389

8.2%

 

36/355

10.1%

 

32/317

10.1%

 

66/279

23.7%

 

 Other

47/942

5.0%

 

107/894

12.0%

 

131/787

16.6%

 

113/647

17.5%

 

 Unknown / missing

57/817

7.0%

 

84/760

11.1%

 

119/675

17.6%

 

152/547

27.8%

 

Mother’s originf:

 Canada

210/4066

5.2%

0.91

318/3845

8.3%

0.0004

415/3516

11.8%

0.0002

501/3063

16.4%

0.64

 Other

52/990

5.3%

 

122/933

13.1%

 

134/809

16.6%

 

104/666

15.6%

 

 Unknown / missing

124/2028

6.1%

 

187/1904

9.8%

 

258/1714

15.1%

 

381/1437

26.5%

 

Maternal level of education:

  < High school

40/490

8.2%

0.0008

55/449

12.2%

< 0.0001

77/390

19.7%

0.0013

63/303

20.8%

0.84

 High school

101/1548

6.5%

 

175/1445

12.1%

 

172/1266

13.6%

 

209/1078

19.4%

 

 College

110/2074

5.3%

 

174/1958

8.9%

 

220/1780

12.4%

 

290/1533

18.9%

 

 University

129/2925

4.4%

 

218/2790

8.9%

 

332/2568

12.9%

 

417/2224

18.8%

 

 Unknown / missing

6/47

12.8%

 

5/40

12.5%

 

6/35

17.1%

 

7/28

25.0%

 

Child rank:

 First

118/3118

3.8%

< 0.0001

206/2995

6.9%

< 0.0001

300/2784

10.8%

< 0.0001

437/2465

17.7%

0.01

  ≥ 2

260/3885

6.7%

 

405/3615

11.2%

 

501/3200

15.7%

 

542/2654

20.4%

 

 Unknown / missing

8/81

9.9%

 

16/72

22.2%

 

6/55

10.9%

 

7/47

14.3%

 

Daycare attendance:

 Yes

251/5461

4.6%

< 0.0001

461/5201

8.9%

0.008

618/4732

13.1%

0.20

760/4066

18.7%

0.21

 No

132/1583

8.3%

 

161/1444

11.1%

 

184/1275

14.4%

 

219/1075

20.4%

 

 Unknown / missing

3/40

7.5%

 

5/37

13.5%

 

5/32

15.6%

 

7/25

28.0%

 

Child with a chronic disease:

 Yes

23/394

7.8%

0.69

46/369

12.5%

0.04

53/323

16.4%

0.09

65/265

24.5%

0.02

 No

357/6650

5.4%

 

577/6279

9.2%

 

747/5686

13.1%

 

917/4878

18.8%

 

 Unknown / missing

6/40

15.0%

 

4/34

11.8%

 

7/30

23.3%

 

4/23

17.4%

 

Gestational age at birth:

  < 37 weeks

35/511

6.8%

0.14

56/476

11.8%

0.04

60/419

14.3%

0.48

86/354

24.3%

0.009

  ≥ 37 weeks

336/6338

5.3%

 

534/5988

8.9%

 

713/5439

13.1%

 

870/4667

18.6%

 

 Unknown / missing

15/235

6.4%

 

37/218

17.0%

 

34/181

18.8%

 

30/145

20.7%

 

Living with a partner

 Yes

339/6504

5.2%

0.004

559/6152

9.1%

0.01

731/5580

13.1%

0.28

901/4795

18.8%

0.11

 No

40/480

8.3%

 

86/438

19.6%

 

57/379

15.0%

 

70/312

22.4%

 

 Unknown / missing

7/100

7.0%

 

12/92

13.0%

 

19/80

23.8%

 

15/59

25.4%

 

Birth attendantf:

 Physician

221/4791

4.6%

< 0.0001

418/4557

9.2%

0.55

516/4126

12.5%

0.05

572/3567

16.0%

0.30

 Midwife or other professionnal

38/252

15.1%

 

22/212

10.4%

 

33/189

17.5%

 

29/151

19.2%

 

 Unknown / missing

127/2041

6.2%

 

187/1914

9.8%

 

258/1724

15.0%

 

385/1448

26.6%

 

Vaccine provider (at 2 months):

 Public health clinics

277/5033

5.5%

0.68

468/4742

9.9%

0.02

595/4264

14.0%

0.02

610/3629

16.8%

< 0.0001

 Medical clinic/Hospital

105/1999

5.3%

 

153/1892

8.1%

 

204/1734

11.8%

 

367/1504

24.4%

 

 Unknown / missing

4/52

7.7%

 

6/48

12.5%

 

8/41

19.5%

 

9/33

27.3%

 

Main vaccine provider (all vaccines):

 Public health clinics only

         

574/3473

16.5%

< 0.0001

 Medical clinic/Hospital or both settings

         

406/1669

24.3%

 

 Unknown / missing

         

6/24

25.0%

 

Missed opportunities at the 2-month visit:

 Yes

48/217

22.1%

< 0.0001

20/166

12.0%

< 0.0001

27/146

18.5%

0.07

27/114

23.7%

0.21

 No

338/6867

4.9%

 

607/6516

9.3%

 

780/5893

13.2%

 

959/5052

19.0%

 

Missed opportunities at the 12-month visit:

 Yes

         

227/702

32.3%

< 0.0001

 No

         

759/4464

17.0%

 
  1. a Analysis limited to children born in Quebec. Both cohorts included / b Correspond to the proportion of children who experienced new vaccine delays by each variable category / cChi-square test, unknown and missing excluded
  2. dCorrespond to the difference between 7183 and the number of children with a dose not administered
  3. eFor DTaP2 the 6682 represent 6698 children without vaccine delay for DTaP1 minus 16 children who had not received DTaP 2. For DTaP3 the 6039 represent 6055 children without vaccine delay for DTaP1 and DTaP2 minus 16 children who had not received DTaP 3. For MMR1 the 5166 represent 5232 children without vaccine delay for DTaP1, DTaP2 and DTaP3 minus 66 children who had not received MMR1
  4. fThese variables were not collected in 2006 and 2008
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