[Incidence of low birth weight of neonates and the influencing factors in China].

OBJECTIVE: To analyze the incidence of low birth weight and identify the influencing factors in China in 2006. METHODS: The national survey was performed by stratified random cluster sampling method in 43 cities and counties in 14 provinces. The subjects were all live neonates during May to October in 2006. Their body weight was measured according to the standardization conducted by the national research team, while the information of all infants was investigated by questionnaires. Non-conditional logistic regression was used to analyze the influencing factors. RESULTS: Among 18 554 infants investigated, the incidence of low birth weight was 4.6% in 2006 in China, being 3.2%, 4.4%, and 6.3% in eastern middle and western areas respectively. The incidence of low birth weight were 3.9% in urban and 4.8% in rural. The results of logistic regression analysis suggested that maternal education (OR = 1.48; 95% CI: 1.181 approximately 1.861), body mass index (BMI) before pregnancy (OR = 1.52; 95% CI: 1.229 - 1.876), body weight gain in gestation period (OR = 1.57; 95% CI: 1.246 - 1.965), gestational weeks (OR = 20.16; 95% CI: 15.456 - 26.297), multiple birth (OR = 12.11; 95% CI: 9.229 - 15.893), gestation syndrome, and nutrition instruction (OR = 0.66; 95% CI: 0.550 - 0.798) were associated with low birth weight significantly. CONCLUSION: The main factors resulting in low birth weight in neonates are maternal education, BMI before pregnancy, body weight gain in gestation period, pregnancy age, multiple birth, gestation syndrome, and nutrition instruction.

[Analysis on the changes of nutritional situation in past 15 years (1990 - 2005) in China the 15 - year establishment of Chinese food and nutrition surveillance system( CFNSS)].

OBJECTIVE: To establish a Food and Nutrition Surveillance System as the supplementation to the Nationwide Nutritional Survey conducted in China for every ten years. To understand the changes and trend of child growth during the period in fast economic development in China. To provide the basis for policy-maker. METHODS: Based on 145 National Disease Monitoring Sites and 600 sampling sites of SSB, to sampling 40 sites as Chinese Food and Nutrition Surveillance sites. Using Child growth Reference by WHO to evaluate the Child development. Using SSB data to assess the nutrient intake by China DDp. RESULTS: The results from 5 round surveillance in 15 years are reliable and are consistent with National Nutrition Survey. The results also become national data and the basis for policy-making. CONCLUSION: The big improvement of child growth has been showed in China in past 15 years. We have to pay attention to child complementation feeding as important as breastfeeding, improvement of Anemia situation for mother and his/her child, Improvement of child growth in Western child and Child problem of floating mothers.

[Factors associated with responses of telephone screening interview in a validity and reliability study of telephone interview to assess dietary intake in urban China].

OBJECTIVE: To describe the first phase of a multi-phase study exploring the possibility of conducting telephone dietary intake interviewing in Beijing, Shanghai and Hong Kong in urban China in 2002. METHODS: Three hundred healthy urban Chinese women aged 20 to 49years were sampled by random telephone screening interviews. RESULTS: Examination of the factors associated with their responses to the telephone screening showed that the completion rates differed by day of the week and time of the day. The completion rates were higher onWednesday and Thursday than other weekdays, and higher on Sunday than Saturday at the weekend. There was a trend for the completion rates to peak from 18 :00 to 21:30 during weekday evenings and between 11:00 and 12:00 AM and 19:00 and 20:00 PM during weekends. There was no significant interviewer difference in the completion rates except for one interviewer in Hong Kong, indicating that interviewer performance did not influence completion rates. Of all numbers dialed, 25% of the responding persons refused, with almost all (94.3%) occurring at or near the beginning of the screening interviews, either before or at invitation. Key reasons for refusal included "hung up without any interaction" (35.1%), "not available to participate" (28.6%) or "not interested in survey" (19.0%). Most of the refusals were firm and not possible to reverse.