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Table 1 Distribution of birth weights for gestational age for babies born to HIV-negative women in Botswana compared with median for babies born to black women in the U.S.

From: Birth weight for gestational age norms for a large cohort of infants born to HIV-negative women in Botswana compared with norms for U.S.-born black infants

Gestational Age (weeks)

N

Minimum (grams)

Lower Quartile (grams)

Median (grams)

Upper Quartile (grams)

Maximum (grams)

U.S. median * (grams)

Δ Median (Botswana - U.S.)

p-value

26

9

700

880

930

1230

1680

857

73

.051

27

20

670

1013

1116

1610

2310

977

139

.004

28

29

790

1120

1260

1740

2700

1120

140

.003

29

54

750

1200

1375

1725

2950

1304

71

.015

30

62

860

1390

1660

2180

2990

1525

135

.002

31

71

810

1535

1815

2630

3300

1804

11

.032

32

119

800

1680

2085

2730

3440

2084

0.6

.099

33

162

1170

2055

2410

2790

3790

2358

52

.370

34

268

1380

2100

2510

2928

3850

2571

- 61

.095

35

394

1180

2320

2700

3060

4200

2733

- 33

.172

36

687

1470

2560

2850

3115

4335

2870

- 20

.164

37

1056

1790

2690

2960

3240

4680

3014

- 53

< .001

38

1758

1900

2820

3060

3330

4550

3158

- 98

< .001

39

2340

1890

2890

3130

3405

5150

3277

- 147

< .001

40

2482

1960

2970

3220

3500

4920

3356

- 135

< .001

41

1357

1980

3000

3290

3600

5000

3399

- 109

< .001

42

746

2000

3000

3300

3610

5080

3346

- 45

.016

43

125

2300

3000

3280

3540

4405

3316

- 35

.492

44

14

2680

3100

3345

3700

4785

3328

16

.583

  1. * Oken E, Kleinman KP, Rich-Edwards J, Gillman MW. A nearly continuous measure of birth weight for gestational age using a United States national reference. BMC Pediatrics 2003;3:10.
  2. Wilcoxon signed rank test.