American journal of industrial medicine · 2002
Occurrence of farmer's lung disease is relevant to meteorological conditions: a 20-year follow-up field survey analysis.
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Takahashi Toru, Ohtsuka Yoshinori, Munakata Mitsuru, Nasuhara Yasuyuki, Kamachi-Satoh Atsuko, Homma Yukihiko, Kawakami Yoshikazu
Аннотация
BACKGROUND: A field survey on farmer's lung disease (FLD) in a dairy farming community in the northernmost district of Japan has been in progress since 1978.
METHODS: The correlation between the number of FLD occurrences year by year and dairy farming conditions and meteorological data were compared.
RESULTS: Thirty-four FLD cases had occurred in a 20 years period. Average number of days below freezing during the harvest season the year prior to FLD occurrence were significantly smaller than other years (2.1 +/- 0.7 [SE] days, 4.6 +/- 0.7 days, P < 0.05, respectively). Average annual sum of the sunlight hours in the years before the years with FLD occurrence was significantly smaller than those without FLD occurrence (1457.1 +/- 114.0 hr, 1811.3 +/- 97.7 hr, P < 0.05, respectively) and was also significantly smaller for the sunlight hours during a harvest season (821.9 +/- 60.2 hr, 1023.2 +/- 52.7 hr, P < 0.05, respectively).
CONCLUSIONS: Temperature and sunlight hours closely associated with the FLD occurrence.
METHODS: The correlation between the number of FLD occurrences year by year and dairy farming conditions and meteorological data were compared.
RESULTS: Thirty-four FLD cases had occurred in a 20 years period. Average number of days below freezing during the harvest season the year prior to FLD occurrence were significantly smaller than other years (2.1 +/- 0.7 [SE] days, 4.6 +/- 0.7 days, P < 0.05, respectively). Average annual sum of the sunlight hours in the years before the years with FLD occurrence was significantly smaller than those without FLD occurrence (1457.1 +/- 114.0 hr, 1811.3 +/- 97.7 hr, P < 0.05, respectively) and was also significantly smaller for the sunlight hours during a harvest season (821.9 +/- 60.2 hr, 1023.2 +/- 52.7 hr, P < 0.05, respectively).
CONCLUSIONS: Temperature and sunlight hours closely associated with the FLD occurrence.