PEDIATRICS Vol. 102 No. 6 December 1998, p. e68
Received Mar 3, 1998; accepted Jul 6, 1998.
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From the * Department of Pediatrics, University of California,
Los Angeles, and
RAND Health, University of California, Los
Angeles/RAND Program on Latino Children with Asthma, Los Angeles,
California; the § University of California, Los Angeles, School of
Nursing, Los Angeles, California; and the
Pediatric Diagnostic
Center, Ventura, California.
Objectives. To determine, in a population of predominantly Latino children with asthma 6 to 18 years old, whether parent and child reports of asthma symptoms with exercise differ and to evaluate the validity of child and parent reports of symptoms.
Design. Data obtained from child and parent interviews; pulmonary function tests (forced vital capacity, forced expiratory volume in 1 second, forced expiratory flow25-75, peak expiratory flow), and observation of symptoms after exercise.
Setting. Three summer camps for minority children with asthma in Los Angeles County.
Participants. A total of 97 children with asthma (78% Latino, 12% non-Latino White, 9% Other; 6 to 18 years of age) and their parents.
Intervention(s). None.
Primary Outcome Measures. Child and parent reports of cough and wheezing with exercise and pulmonary function tests before and after exercise. While at camp, children underwent spirometry after completing the self-administered survey. The pulmonary function tests were conducted and interpreted according to the pediatric specifications for spirometry, and results >80% of predicted, adjusted for gender, age, height, and race, were considered normal. Six peak expiratory flow rates (PEFR) by peak flow meter also were recorded by trained research assistants immediately before spirometry, and values >80% of predicted based on height were considered normal. To observe child symptoms with exercise, children participated in a relay running race of 200 feet followed by a swimming race of 300 feet. Research assistants measured heart rate and 6 PEFRs using ASSESS portable peak flow meters immediately before and after each exercise. A positive exercise challenge was defined as a 15% reduction in mean PEFR and/or observed asthma symptoms (cough, wheezing, chest pain, asthma attack).
Results. Of the children, 18% reported never having a
cough when they exercised, 46% reported having it occasionally when
they exercised, and 36% reported having it quite often or always when
they exercised. For wheezing, 20% of children reported never having
wheezing when they exercised, 35% having it occasionally when they
exercised, and 45% having it quite often or always when they
exercised. Parents reported fewer symptoms than did their children. Of
the parents, 34% reported that their children did not have cough with
exercise, 37% reported few to some days, and 29% reported most days
or every day. Forty-seven percent of parents reported that their child did not wheeze with exercise in the last 2 months, 35% reported wheezing on a few days to some days, and 17% reported wheezing most
days to every day.Parent and child reports of cough or wheezing after exercise correlated
mildly with each other (parent/child cough r = 0.23;
= 0.03; parent/child wheezing r = 0.21;
= 0.14). Children were more likely to report cough: 59 of 71 (83%) of
children versus 44 of 71 (62%) of parents. The 22 children who
reported cough when their parents did not account for most of the
disagreement between parents and children. Children were more likely
than were their parents to report wheezing; 55 of 69 (80%) children
versus 36 of 69 (52%) parents reported that the child wheezed. The 24 children who reported wheezing when their parents did not account for
most of the disagreement between parents and children. Forty-seven percent of the children had a value <80% of predicted for
at least one of the four spirometry tests; 29% of mean baseline PEFRs
were <80% of predicted. Overall, 86% of the children met one or more
of the following: any percent of predicted pulmonary function tests
<80% or any symptom or PEFR reduction of 15% after exercise, or
other occurrence of nonexercise symptoms during camp. Almost all child reports of cough and wheezing correlated significantly
with the criterion validity criteria. For example, child reports of
wheezing were, as expected, correlated negatively with the percent of
predicted FEV1 (r =
0.28) and
correlated positively with observed symptoms after exercise
(r = 0.3). On the other hand, neither parent
reports of cough nor those of wheezing correlated significantly with
any of the pulmonary function tests or symptomatic validity criteria. Parent reports of wheezing were correlated positively with construct
validity variables such as 1) parent reports of child's bother
(r = 0.35) and activity limitation
(r = 0.23) because of asthma; 2) more use of
rescue or bronchodilator medications (r = 0.18); 3) more parent worry about asthma overall
(r = 0.29); and 4) parent perception of asthma
severity being moderate to very severe instead of mild or very mild
(r = 0.28). Child reports of cough and wheezing
were not correlated significantly with almost all of the
parent-reported factors hypothesized to be associated with asthma
morbidity.
Conclusions. Clinicians and researchers evaluating asthma morbidity in children should elicit child reports of symptoms. More research is necessary to understand discordance between child and parent reports of symptoms and its relationship to asthma morbidity experienced by the child. Key words: childhood asthma, Latino/Hispanic, exercise symptoms, parent perception, child perception.
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