Changing Pattern of Birth Weight and Relationship of Birth Weight with Maternal Age and Parity

출생시 체중변화의 양상과 산모의 연령 및 출산순위와의 관계

The objectives of this study were to examine the changes of birth weight and relationship of birth weight with maternal age and parity. The study population included 13,634 single live births out of 14,346 births delivered at a general hospital in Busan between January 1, 1977 and December 31, 1956. Data were obtained from the delivery record. In 1979 the mean birth weight of male was 3,074 gm and that of female was 2,985 gm. In 1986 birth weight of male was increased to 3,266 gm and that of female to 3,210 gm. Low birth weight ($\leq$2,500 gm) incidence rate was 7.2% in 1977 and it was increased gradually to 10.4% in 1980 but decreased thereafter to 6.5% in 1986. Incidence rate of overweight infant (4,001 gm $\leq$) was 3.9% for 10 years and it ranged from 2.9% to 4.6% but no particular changing pattern was observed. The percentage of mothers who had history of induced abortion was decreased from 51.6% in 1979 to 45.1% in 1986. Also, stillbirth rate was decreased from 2.6% in 1977 to 1.5% in 1986. The proportion of the first and second births was increased from 55.4% in 1977 to 96.0% in 1986 and the proportion of mothers of 25-34 years increased from 72.1% in 1977 to 84.7% in 1986. The incidence rates of low birth weight and over weight infant are lower in the first and second births of 25-34 years old mothers than other parities and age groups. Increased mean birth weight and decreased low birht weight incidence rate indicate that the health status of newborn infants has been improved and substantial portion of these changes can be attributed to increase in family planning practice rate and delayed marriage. There is no evidence, however, for increasing incidence rate of overweight infant.

출생시 체중변화의 양상과 산모의 연령 및 출산순위와의 관계를 알아보기 위하여 1977년 1월부터 1986년 12월까지 부산시내 1개 종합병원에서 총 14,346건의 분만 가운데 20주이후에 출생한 단태아 13,634명을 대상으로 산실의 분만대장에서 신생아의 출생순위분포, 산모의 연령분포, 신생아의 체중분포와 평균체중, 산모의 연령과 출산순위에 따른 저 체중아와 과체중아의 출생을, 유산경험율과 사산율을 조사하였다. 신생아의 평균체중은 1979년에는 남아 3074gm, 여아 2985gm에서 1986년에는 남아 3266gm, 여아 3210gm 으로 증가하였고, 저체중아의 발생율은 1977년 7.2%에서 점차 증가하여 1980년에는 10.4%였으나 그후 점점 감소하여 1986년에는 6.5%였다. 과체중아의 발생율은 2,9%에서 4.6%사이로 평균 3.9%였으며 특별한 변화 양상은 볼 수 없었다. 유산을 경험 한 산모의 비율은 1979년에 51.6%에서 1986년에는 45.1%로 감소하였고, 사산율도 1977년에는 2.6%에서 1986년에는 1.5%로 감소했다. 이와같은 변화에는 가족계획 실천율의 증가와 결혼연령의 상승으로 $25{\sim}34$세사이 산모의 1과 2순위 출생아가 차지하는 비율이 증가한 것이 크게 영향을 미친 것으로 생각되며, 과체중아의 비율은 늘지 않고 오히려 저체중아의 출생율은 감소되어 전체적으로 신생아의 건강이 향상되고 있는 것으로 나타났다.