Sask萨斯卡通Natl研究委员会建筑研究部（DBR）对室内温度和湿度（18）进行了一系列测量。，1960-61年间，加拿大六所小学（1-8年级；6-14岁）的室内相对湿度对缺勤的影响进行了初步研究。1970年，根据DBR在1960-61年为六所学校采集的数据，绘制了相对湿度与总缺勤率（因各种原因缺勤）的曲线图（图1）。该数据的相关系数r=0。 93超过5%的显著性水平r0。1= 0.917. 1971-72年冬天，一项研究在同样的六所学校加上其他六所学校进行，试图确认结果并找出相关性的原因。此外，还获得了新斯科舍省哈利法克斯市六所学校的旷课数据，并与DBR在1961-62年获取的类似温度和相对湿度数据（19）进行了关联。结果与萨斯卡通公立学校的结果相似。这些研究表明，随着空间相对湿度的增加，缺勤人数减少； 其他两项研究（15,16）也证实了这一结果，这两项研究也支持了这样的猜测，即加拿大学校缺勤率的减少是室内相对湿度较高时上呼吸道疾病减少的直接结果。在讨论学校作为传播空气传播疾病的手段时，以及在确定相对湿度对空气传播细菌存活率的影响的实验室调查中，提出了此类疾病减少的一个可能原因。 引文:ASHRAE交易，第80卷，第2部分，蒙特利尔，QC

A series of measurements of indoor temperature and humidity (18) made by the Div. of Bldg Research (DBR), Natl Research Council of Saskatoon, Sask., Canada in six primary schools (grades 1 - 8; ages 6 - 14) in 1960-61 was used in a preliminary study of the effect of indoor relative humidity on absenteeism. In 1970 a plot (Fig. 1) of relative humidity versus total absenteeism (absenteeism due to all causes) was made from the data taken by DBR in 1960-61 for the six schools. The correlation coefficient of this data r = 0.93 exceeds the 5% level of significance r0.1= 0.917. A study was then conducted in the winter of 1971-72 with the same six schools plus six others in an attempt to confirm the results and find reasons for the correlation.Also, absenteeism data for six schools of the City of Halifax, Nova Scotia, were obtained and correlated with similar temperature and relative humidity data (19) taken by DBR, in 1961-62. The results were similar to those obtained from the Saskatoon Public Schools. These studies indicated that there was a reduction in absenteeism with increase in the relative humidity of the space; the results are confirmed by two other studies (15,16) which also support the speculation that reduction in absenteeism in the Canadian schools is a direct result of reduction in upper respiratory diseases at the higher indoor relative humidities.A possible reason behind the reduction in such diseases is made in a discussion of the school as a means for transmitting airborne disease and in laboratory investigations which have established the effect of relative humidity on the survival rate of airborne bacteria.