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Table 2 Cox model measure hazard ratios and 95% confidence intervals of asthma associated with primary Sjögren’s syndrome and covariates

From: Risk of asthma in patients with primary Sjögren’s syndrome: a retrospective cohort study

Variables

Events

IR

HR (95% CI)

Univariate

Multivariatea

Primary SS

 No

844

6.10

1.00

1.00

 Yes

337

9.86

1.62 (1.42 − 1.83)***

1.38 (1.21 − 1.58)***

Sex

 Women

1007

6.62

1.00

1.00

 Men

174

8.45

1.26 (1.07 − 1.48)**

0.90 (0.76 − 1.06)

Age, years

 20 − 39

134

3.95

1.00

1.00

 40 − 59

504

5.61

1.41 (1.17 − 1.71)***

1.41 (1.16 − 1.70)***

  ≥ 60

543

11.1

2.74 (2.27 − 3.31)***

2.65 (2.19 − 3.22)**

Comorbidity

Allergic rhinitis

 No

952

6.13

1.00

1.00

 Yes

229

13.1

2.08 (1.80 − 2.41)***

1.76 (1.51 − 2.06)***

Chronic sinusitis

 No

1116

6.61

1.00

1.00

 Yes

65

17.5

2.58 (2.01 − 3.32)***

1.71 (1.31 − 2.22)***

Atopic dermatitis

 No

1153

6.77

1.00

1.00

 Yes

28

11.8

1.67 (1.15 − 2.43)**

1.39 (0.95 − 2.02)

COPD

 No

1123

6.58

1.00

1.00

 Yes

58

29.8

4.30 (3.30 − 5.60)***

2.52 (1.91 − 3.33)***

GERD

 No

1167

6.80

1.00

1.00

 Yes

14

15.2

2.03 (1.20 − 3.41)**

1.28 (0.75 − 2.17)

Obesity

 No

1171

6.81

1.00

1.00

 Yes

10

14.1

2.02 (1.09 − 3.77)*

2.05 (1.10 − 3.82)*

  1. CI confidence interval, COPD chronic obstructive pulmonary disease, GERD gastroesophageal reflux disease, HR hazard ratio, IR incidence density rate per 1000 person-years, SS Sjögren’s syndrome
  2. aModel was adjusted for sex, age and comorbidity in Cox proportional hazards
  3. regression
  4. *p <0.05, **p <0.01, ***p <0.001