Gurin's modification of the Health Opinion Survey was completed by 178 medical students, aged 19 to 25 yr., and 241 secondary school pupils, aged 9 to 19 yr. Internal consistency reliability measured by coefficient alpha was .77 and .79, respectively, on the two ratings. The mean of the correlation of each item with the remaining items was .34 for each rating. These findings show that the items on the instrument have much in common, which implies that a single trait may be measured by the Health Opinion Survey.
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