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Table 2 Basic description of the PAMPER birth population 1961–92

From: Temporal changes in key maternal and fetal factors affecting birth outcomes: A 32-year population-based study in an industrial city

Variable

1961–70

1971–80

1981–92

N missing (%)

    

1961–92

Maternal age (years)

   

1796 (1.8)

Mean (± SD)

26.4 (6.2)

24.9 (5.2)

25.8 (5.3)

 

≤ 19 [n (%)]

3037 (11.6)

4510 (15.1)

4913 (12.3)

 

20–24 [n (%)]

8694 (33.2)

10676 (35.6)

12075 (30.3)

 

25–29 [n (%)]

6772 (25.9)

9420 (31.4)

13123 (32.9)

 

30–34 [n (%)]

4386 (16.8)

3917 (13.1)

7290 (18.3)

 

35–40 [n (%)]

2426 (9.3)

1149 (3.8)

2175 (5.5)

 

40–44 [n (%)]

807 (3.1)

259 (0.9)

287 (0.7)

 

45+ [n (%)]

52 (0.2)

25 (0.1)

20 (0.1)

 

Parity [n (%)]

   

1290 (1.3)

Parity = 0 (primipara)

10753 (41.1)

13659 (45.4)

17888 (44.4)

 

Parity = 1

5673 (21.7)

9798 (32.6)

13209 (32.8)

 

Parity = 2

3803 (14.5)

4121 (13.7)

5794 (14.4)

 

Parity = 3

2101 (8.0)

1478 (4.9)

2114 (5.2)

 

Parity = 4

1458 (5.6)

589 (2.0)

799 (2.0)

 

Parity = 5

1004 (3.8)

225 (0.7)

278 (0.7)

 

Parity = 6+

1383 (5.3)

201 (0.7)

191 (0.5)

 

Baby's birthweight (g)

   

1360 (1.4)

Mean (± SD)

3244.2 (603.7)

3266.5 (540.3)

3297.0 (558.0)

 

<1000 [n (%)]

150 (0.6)

75 (0.2)

128 (0.3)

 

1000–1499 [n (%)]

270 (1.0)

181 (0.6)

238 (0.6)

 

1500–1999 [n (%)]

481 (1.8)

354 (1.2)

496 (1.2)

 

2000–2499 [n (%)]

1452 (5.6)

1445 (4.8)

1790 (4.4)

 

2500–2999 [n (%)]

5132 (19.6)

6033 (20.1)

7504 (18.6)

 

3000–3499 [n (%)]

9920 (37.9)

12175 (40.5)

15722 (39.1)

 

3500–3999 [n (%)]

6719 (25.7)

7642 (25.4)

10852 (27.0)

 

4000–4499 [n (%)]

1714 (6.6)

1907 (6.3)

3065 (7.6)

 

4500+ [n (%)]

310 (1.2)

235 (0.8)

459 (1.1)

 

Gestational age (weeks)

   

3562 (3.6)

Mean (± SD)

39.5 (2.2)

39.4 (1.9)

39.1 (2.0)

 

< 32 [n (%)]

288 (1.1)

224 (0.8)

387 (1.0)

 

32–36 [n (%)]

1533 (6.0)

1557 (5.3)

2415 (6.1)

 

37+ [n (%)]

23769 (92.9)

27351 (93.9)

36723 (92.9)

 

Infant gender

   

10 (0.01)

Male/Female ratio

1.08

1.06

1.07

 

Mode of delivery

   

1763 (1.8)

Normal vertex delivery [n (%)]

20000 (76.8)

22517 (75.1)

29182 (72.9)

 

Assisted (forceps/vacuum extraction) [n (%)]

3675 (14.1)

4502 (15.0)

5635 (14.1)

 

Caesarean section [n (%)]

1822 (7.0)

2484 (8.3)

4670 (11.7)

 

Breech extraction [n (%)]

543 (2.1)

470 (1.6)

506 (1.3)

 

Stillbirth [n (rate per 1000)]

688 (18.2)

325 (10.5)

227 (5.6)

 

Infant mortality [n (rate per 1000)]

770 (20.8)

453 (14.7)

281 (7.0)

 

Quintiles of ED TDS

   

2095 (2.1)

1 (most affluent)

≤ 0.04

≤ -1.40

≤ -1.49

 

2

> 0.04 to ≤ 3.01

>-1.40 to ≤ 2.43

>-1.49 to ≤ 2.18

 

3

>3.01 to ≤ 4.9

>2.43 to ≤ 4.56

>2.18 to ≤ 5.06

 

4

>4.9 to ≤ 6.2

>4.56 to ≤ 6.33

>5.06 to ≤ 7.04

 

5 (most deprived)

>6.2

> 6.33

> 7.04

 

Address grid referenced

   

1110 (1.1)

Paternal occupation (coded)

   

29419 (30.1)

  1. Note: Number of births used for denominator = 109,086 (for calculation of stillbirth (per 1000 total births) and infant mortality rates (per 1000 live births); number of births from hospital records with information on covariates listed in the table = 97,809 (percentages of missing data are given using 97,809 as a total).
  2. Percentages of the categories were calculated from the total with known data for a variable.
  3. ED TDS = Townsend Deprivation Score at the enumeration district level.
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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