Diabetes Care, Vol 9, Issue 3 236-243, Copyright © 1986 by American Diabetes Association
Subjective symptoms, blood glucose estimation, and blood glucose concentrations in adolescents with diabetes
A Freund, SB Johnson, A Rosenbloom, B Alexander and CA Hansen
Twenty-five adolescent campers with insulin-dependent diabetes mellitus
(IDDM) completed a Symptom Rating Checklist and estimated their blood
glucose (BG) immediately before having their BG assessed four times daily
for 11 days. Consistent relationships between BG and symptoms were not
identified when the data were analyzed for the group as a whole. However,
when each camper's data were analyzed separately, 23 of the 25 adolescents
had at least one significant glycemia-symptom (G-S) correlation. Each
camper seemed to have a unique G-S pattern; only one symptom (hungry) was
significantly related to BG for more than half of the youngsters studied.
Almost all of the significant G-S correlations were indicative of low
rather than high BG. However, when asked, few campers were able to
accurately identify which symptoms were reliably associated with low or
high BG. In this study, different measures of BG estimation error led to
different results. The percent of estimates +/- 20% of the actual BG value
(55% in this study) was strongly influenced by the actual BG reading
because higher BG values have larger accuracy ranges than lower BG
concentrations. When estimated BG was simply subtracted from actual BG,
under- and overestimates canceled each other out, resulting in an unusually
small estimated error (5 mg/dl in this investigation). The absolute
difference score ignores the direction of estimation error, but may more
accurately reflect patients' average estimation error (68 mg/dl in this
study). When actual and estimated BG values were correlated for the group
as a whole, the patients appeared to be highly accurate at estimating BG (r
= .93, P less than .0001).(ABSTRACT TRUNCATED AT 250 WORDS)