ABSTRACT
Small for gestational age (SGA) infants are at increased risk for morbidity and mortality. The objective of this study was to develop a birthweight for gestational age reference that more accurately represents the Washington state population, focusing on SGA. Washington state birth certificate files of singleton births in 1989 to 1998 were used to develop the 3rd, 10th, 50th, and 90th percentiles of birthweight for gestational age for males and females. The Washington state 10th percentile curve most closely approximates a nationally representative reference, whereas an earlier but widely used California-based reference had the lowest centiles across gestational age with few exceptions. Using the Washington reference, 8.4% of Washington births would be classified as SGA (< 10th percentile), compared with 5.5 and 7.4% using the California and national reference, respectively. The new reference may be helpful in assessing local regional data, and other areas with similar demographics, and provide more relevant clinical guidance.
KEYWORDS
Birthweight - gestational age - fetal growth
REFERENCES
-
1
McIntire D D, Bloom S L, Casey B M, Leveno K J.
Birth weight in relation to morbidity and mortality among newborn infants.
N Engl J Med.
1999;
340
1234-1238
-
2
Strauss R S.
Adult functional outcome of those born small for gestational age: twenty-six-year follow-up of the 1970 British Birth Cohort.
JAMA.
2000;
283
625-632
-
3 Brown E. Long-term sequelae of preterm birth. In: Fuchs A, Fuchs F, Stubblefield P Preterm Birth: Causes, Prevention, and Management. New York; McGraw-Hill 1993: 447-492
-
4
Goldenberg R L, Cliver S P.
Small for gestational age and intrauterine growth restriction: definitions and standards.
Clin Obstet Gynecol.
1997;
40
704-714
-
5
Alexander G R, Kogan M, Martin J, Papiernik E.
What are the fetal growth patterns of singletons, twins, and triplets in the United States?.
Clin Obstet Gynecol.
1998;
41
114-125
-
6
Alexander G R, Kogan M D, Himes J H, Mor J M, Goldenberg R.
Racial differences in birthweight for gestational age and infant mortality in extremely-low-risk US populations.
Paediatr Perinat Epidemiol.
1999;
13
205-217
-
7
Lubchenco L O, Hansman C, Dressler M, Boyd E.
Intrauterine growth as estimated from liveborn birth-weight data at 24 to 42 weeks of gestation.
Pediatrics.
1963;
32
793-800
-
8
Williams R L, Creasy R K, Cunningham G C, Hawes W E, Norris F D, Tashiro M.
Fetal growth and perinatal viability in California.
Obstet Gynecol.
1982;
59
624-632
-
9
Alexander G R, Kogan M D, Himes J H.
1994-1996 U.S. singleton birth weight percentiles for gestational age by race, Hispanic origin, and gender.
Matern Child Health J.
1999;
3
225-231
-
10 Guzman B. The Hispanic population: 2000, Census 2000 Brief. Washington, DC; U.S. Census Bureau May 2001
-
11 McKinnon J. The Black population: 2000, Census 2000 Brief. Washington, DC; U.S. Census Bureau August 2001
-
12 Hobbs F, Stoops N. Demographic trends in the 20th century. Census 2000 Special Reports, Series CENSR-4. Washington, DC; U.S. Census Bureau November 2001
-
13 Fingerhut L A, Kleinman J C. Comparability of reporting between the birth certificate and the 1980 National Natality Survey. Vital Health Stat 2 1985 99: 1-34
-
14
Buescher P A, Taylor K P, Davis M H, Bowling J M.
The quality of the new birth certificate data: a validation study in North Carolina.
Am J Public Health.
1993;
83
1163-1165
-
15
Piper J M, Mitchel Jr E F, Snowden M, Hall C, Adams M, Taylor P.
Validation of 1989 Tennessee birth certificates using maternal and newborn hospital records.
Am J Epidemiol.
1993;
137
758-768
-
16
Emery III E S, Eaton A, Grether J K, Nelson K B.
Assessment of gestational age using birth certificate data compared with medical record data.
Paediatr Perinat Epidemiol.
1997;
11
313-321
-
17
Cleveland W.
Robust locally weighted regression and smoothing scatterplots.
J Am Stat Assoc.
1979;
74
828-836
-
18 Cleveland W. Visualizing Data. Summit, NJ; Hobart Press 1993
-
19
Ananth C V, Wen S W.
Trends in fetal growth among singleton gestations in the United States and Canada, 1985 through 1998.
Semin Perinatol.
2002;
26
260-267
-
20
Cogswell M E, Yip R.
The influence of fetal and maternal factors on the distribution of birthweight.
Semin Perinatol.
1995;
19
222-240
-
21
Kramer M S.
Socioeconomic determinants of intrauterine growth retardation.
Eur J Clin Nutr.
1998;
52(suppl 1)
S29-S33
-
22
Alexander G R, Kogan M D.
Ethnic differences in birth outcomes: the search for answers continues.
Birth.
1998;
25
198-201
-
23
Shiono P H, Rauh V A, Park M, Lederman S A, Zuskar D.
Ethnic differences in birthweight: the role of lifestyle and other factors.
Am J Public Health.
1997;
87
787-793
-
24
Le L T, Kiely J L, Schoendorf K C.
Birthweight outcomes among Asian American and Pacific Islander subgroups in the United States.
Int J Epidemiol.
1996;
25
973-979
-
25
Mongelli M, Gardosi J.
Birth weight, prematurity and accuracy of gestational age.
Int J Gynaecol Obstet.
1997;
56
251-256
-
26
Mongelli M, Wilcox M, Gardosi J.
Estimating the date of confinement: ultrasonographic biometry versus certain menstrual dates.
Am J Obstet Gynecol.
1996;
174
278-281
-
27
Todros T, Ronco G, Lombardo D, Gagliardi L.
The length of pregnancy: an echographic reappraisal.
J Clin Ultrasound.
1991;
19
11-14
-
28
Waldenstrom U, Axelsson O, Nilsson S.
Sonographic dating of pregnancies among women with menstrual irregularities.
Acta Obstet Gynecol Scand.
1991;
70
17-20
-
29
Mustafa G, David R J.
Comparative accuracy of clinical estimate versus menstrual gestational age in computerized birth certificates.
Public Health Rep.
2001;
116
15-21
-
30
DiPietro J A, Allen M C.
Estimation of gestational age: implications for developmental research.
Child Dev.
1991;
62
1184-1199
-
31
Alexander G R, Allen M C.
Conceptualization, measurement, and use of gestational age. I: clinical and public health practice.
J Perinatol.
1996;
16
53-59
Sherry LipskyPh.D. M.P.H.
Dallas Regional Campus, University of Texas School of Public Health
5323 Harry Hines Blvd., V8.112, Dallas, TX 75390-9128
