Table 5 Association of fertility with impaired fecundity: Results of Poisson regression examining the independent contributions of pregnancies per woman-year (excluding abortion), asthma only, smoking, the interactions of asthma and of smoking with number of pregnancies and other predictors to number of spontaneous pregnancy losses per woman-year (excluding abortion) in women aged 15ā€“44 years in the NSFG (*Nā€‰=ā€‰7,239).

From: Asthma and/or hay fever as predictors of fertility/impaired fecundity in U.S. women: National Survey of Family Growth

Characteristic

Coeff.

Std. Error

t

p

95% Confidence Interval

Number of Pregnancies (P)

6.4854

0.2780

23.33

<0.001

5.9369, 7.0340

Asthma and/or Hay Fever

Ā Ā Ā Ā Asthma Only

0.4240

0.1452

2.92

0.004

0.1375, 0.7105

Ā Ā Ā Ā Hay Fever Only

0.0229

0.1274

0.18

0.858

āˆ’0.2286, 0.2743

Ā Ā Ā Ā Asthma & Hay Fever

0.3496

0.1203

2.91

0.004

0.1123, 0.5869

Ā Ā Ā Ā Neither

(ref)

Ā Ā Ā Ā 

Smoke

āˆ’0.0253

0.0688

āˆ’0.37

0.714

āˆ’0.1611, 0.1105

Asthma and/or Hay Fever Xā€  P

Ā Ā Ā Ā Asthma Only X P

āˆ’1.1133

0.3811

āˆ’2.92

0.004

āˆ’1.8651, āˆ’0.3615

Ā Ā Ā Ā Hay Fever Only X P

āˆ’0.0954

0.6940

āˆ’0.14

0.891

āˆ’1.4646, 1.2738

Ā Ā Ā Ā Asthma & Hay Fever X P

āˆ’0.9257

0.4924

āˆ’1.88

0.062

āˆ’1.8970, 0.0456

Smoke X P

1.3020

0.3130

4.16

<0.001

0.6846, 1.9194

Age

0.0228

0.0046

4.96

<0.001

0.0137, 0.0318

Race/Ethnicity

Ā Ā Ā Ā Hispanic

āˆ’0.0811

0.0711

āˆ’1.14

0.255

āˆ’0.2213, 0.0591

Ā Ā Ā Ā Non-Hispanic Black

āˆ’0.1286

0.0791

āˆ’1.62

0.106

āˆ’0.2846, 0.0276

Ā Ā Ā Ā Non-Hispanic Others

āˆ’0.0617

0.1444

āˆ’0.43

0.670

āˆ’0.3465, 0.2231

Ā Ā Ā Ā Non-Hispanic White

(ref)

Ā Ā Ā Ā 

Marital Status

Ā Ā Ā Ā Married

āˆ’0.2169

0.0872

āˆ’2.49

0.014

āˆ’0.3890, āˆ’0.0449

Ā Ā Ā Ā Previously Married

āˆ’0.2221

0.0967

āˆ’2.30

0.023

āˆ’0.4128, āˆ’0.0313

Ā Ā Ā Ā Never Married

(ref)

Ā Ā Ā Ā 

Region

Ā Ā Ā Ā North East

āˆ’0.0076

0.0708

āˆ’0.11

0.915

āˆ’0.1473, 0.1322

Ā Ā Ā Ā Midwest

āˆ’0.1018

0.0847

āˆ’1.20

0.231

āˆ’0.2689, 0.0654

Ā Ā Ā Ā South

0.0192

0.0731

0.26

0.793

āˆ’0.1250, 0.1634

Ā Ā Ā Ā West

(ref)

Ā Ā Ā Ā 

High School Grad or GED

0.2237

0.0652

3.43

<0.001

0.0951, 0.3522

% Poverty Index

0.0010

0.0001

8.40

<0.001

0.0007, 0.0012

PID

0.3044

0.0712

4.27

<0.001

0.1639, 0.4449

Diabetes

āˆ’0.0479

0.2445

āˆ’0.20

0.845

āˆ’0.5302, 0.4344

Hypertension

āˆ’0.0058

0.0930

āˆ’0.06

0.951

āˆ’0.1891, 0.1776

BMI Category

Ā Ā Ā Ā Underweight

0.0904

0.0993

0.91

0.364

āˆ’0.1055, 0.2863

Ā Ā Ā Ā Overweight

0.0352

0.0591

0.60

0.552

āˆ’0.0814, 0.1517

Ā Ā Ā Ā Obese

0.1031

0.0828

1.25

0.214

āˆ’0.0601, 0.2664

Number Male Partners

0.0088

0.0045

1.98

0.050

0.0000, 0.0768

Constant

āˆ’6.1463

0.2041

āˆ’30.11

<0.001

āˆ’6.5490, āˆ’5.7436

  1. Xā€ ā€‰=ā€‰interaction; GED general equivalency diploma; ref reference group.
  2. *N reduced due to missing data.
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