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Table 2 Characteristics of the study population from Four Memorial Care Hospitals in Southern California

From: Comparison of birth certificates and hospital-based birth data on pregnancy complications in Los Angeles and Orange County, California

 

Matched memorial care data

Unmatched Memorial Care data

p-value*

Matched birth certificate data

Unmatched birth certificate data

p-value**

 

Valid matching variables

Missing matching variables

  

Valid matching variablesa

 

N

62200

4162

6138

 

62200

9312

 

Rate of preeclampsia (2001–2006 data)

3.13

3.73

4.12

<0.01

1.38

1.97

<0.01

Rate of preeclampsia (2001–2005 data)

3.12

3.70

4.12

<0.01

1.34

1.75

<0.01

Rate of preeclampsia (2006 data only)

3.13

3.90

N.A.

0.41

1.57

2.23

<0.01

Rate of total diabetes (2001–2005 data)

5.56

6.65

5.46

0.17

1.97

2.11

0.40

Rate of total diabetes (2006 data only)

6.93

7.20

N.A.

0.35

2.24

3.67

<0.01

Rate of gestational diabetes (2006 data only)

N.A.

N.A.

N.A.

 

1.62

2.57

0.01

Rate of chronic diabetes (2006 data only)

N.A.

N.A.

N.A.

 

0.62

1.10

0.04

Maternal ageb (%)

   

<0.01

  

<0.01

  <20

6.62

5.77

N.A.

 

6.62

5.76

 

 20–29

42.38

39.60

N.A.

 

42.44

39.79

 

 30–39

46.75

47.57

N.A.

 

46.77

48.41

 

 40+

4.18

6.78

N.A.

 

4.16

6.04

 

 Unknown

0.07

0.29

N.A.

 

0.00

0.00

 

Maternal ageb (years): mean ± standard deviation

29.79 ± 6.17

30.56 ± 6.46

N.A.

<0.01

29.78 ± 6.16

30.44 ± 6.34

<0.01

Maternal education (%)

      

<0.01

 College or higher

N.A.

N.A.

N.A.

 

57.26

52.71

 

 High school or lower

N.A.

N.A.

N.A.

 

40.82

43.93

 

 Unknown

N.A.

N.A.

N.A.

 

1.92

3.36

 

Race/ethnicityb (%)

   

<0.01

  

<0.01

 Asian

10.49

9.61

N.A.

 

13.65

14.85

 

 Black

8.47

6.68

N.A.

 

8.96

6.20

 

 Hispanic

33.01

42.74

N.A.

 

36.97

39.42

 

 Non-Hispanic White

39.62

30.56

N.A.

 

37.62

35.72

 

 Other

4.52

5.00

N.A.

 

1.91

1.98

 

 Unknown

3.88

5.41

N.A.

 

0.89

1.84

 

Insuranceb (%)

   

<0.01

  

<0.01

 Private

65.95

57.81

N.A.

 

66.77

66.91

 

 Public

29.97

35.66

N.A.

 

32.69

32.25

 

 Other

0.00

0.00

N.A.

 

0.44

0.63

 

 Unknown

4.07

6.54

N.A.

 

0.11

0.20

 
  1. * p-value for the comparison between the matched Memorial Care and the unmatched Memorial Care data with valid matching variables
  2. ** p-value for the comparison between the matched birth certificate data and the unmatched birth certificate data (all had valid matching variables)
  3. aAll records in the unmatched birth certificate data had valid matching variables
  4. bBoth databases have reported values for these variables. In this table, we calculated the statistic summaries based on the values reported in each specific database