Rumi Seko

BACKGROUND: Although a household questionnaire survey is important for estimating vaccination coverage, it raises several problematic issues.<br>METHODS: A household survey was conducted on 900 subjects aged 2, 4, and 6 years living in Obu City, Japan, and a second survey for non-respondents to the first survey was then conducted. Questionnaires bearing a subject's name were used for half of the subjects, while the others were anonymous (the named and nameless groups, respectively). The vaccination dates of six kinds of vaccines, including poliovirus and measles vaccine, for those in the named group were reviewed using the administrative records at the Obu City Health Center.<br>RESULTS: The response rate was 70.1% in the first survey and 84.1% in the first and second surveys combined. The response rate for both groups was nearly equal. Based on administrative records in the named group, the vaccination coverage in the respondents was 0.9-2.9% higher than that in total subjects, and that in the respondents to the first survey was 0.8-4.9% higher. There were very few inconsistencies in the vaccination status between responses to the questionnaire and data of administrative records among respondents in the named group.<br>CONCLUSIONS: These results suggested that vaccination coverage from a household questionnaire survey in Japan might not be extremely biased by either non-responses or incorrect answers.<br>J Epidemiol 2005;15:15-19.

34人の健康な中年男性運転手について,身体活動量,ホルター心電図,24時間血圧を勤務日とそれに続く2日間の非勤務日について測定した.勤務は朝7時より24時間であり,その後の48時間が非勤務であった.ホルター心電計による72時間の測定記録は,そのR-R間隔の変動についてcomplex demodulation法により解析した.中心周波数0.30Hzの高周波成分(HF)の振幅,中心周波数0.09Hzの低周波成分の高周波成分に対する比(L/H)を算出した.血圧は30分ごとに72時間連続測定した.勤務日の血圧は非勤務日に比べて有意に高く,その傾向は血圧の高い群で顕著であった.心拍変動については,全体としては勤務日と非勤務日で有意差はみられなかった.勤務日のHF,L/Hの時間的変化から,夜間の勤務時には逆位相にあるサーカディアンリズムの影響を強く受けていることが示された