TABLE 3

Comparison of prevalence of asthma symptoms by video questionnaire among South African adolescents, 2002 (ISAAC III) and 2017 (GAN I)

Timeframe2002 (ISAAC III) n (%)2017 (GAN I) n (%)2002 to 2017 OR (95% CI)
Wheeze
 Ever840 (16.9)887 (22.5)1.45 (1.30–1.61)
 In the last 12 months559 (11.2)737 (18.7)1.84 (1.63–2.07)
 In the last month351 (7.0)513 (13.0)1.92 (1.66–2.21)
Exercise-induced wheeze
 Ever1070 (21.3)1480 (37.5)2.23 (2.03–2.44)
 In the last 12 months692 (13.9)1205 (30.6)2.76 (2.49–3.07)
 In the last month466 (9.4)890 (22.6)2.86 (2.53–3.23)
Nocturnal wheeze
 Ever459 (9.2)517 (13.1)1.50 (1.32–1.72)
 In the last 12 months265 (5.3)376 (9.5)1.90 (1.61–2.23)
 In the last month194 (3.9)275 (7.0)1.87 (1.55–2.26)
Nocturnal cough
 Ever1501 (30.1)1147 (29.1)0.97 (0.88–1.06)
 In the last 12 months957 (19.2)863 (21.9)1.19 (1.08–1.32)
 In the last month620 (12.5)618 (15.7)1.32 (1.17–1.49)
Severe wheeze
 Ever603 (12.1)583 (14.8)1.28 (1.13–1.44)
 In the last 12 months347 (7.0)403 (10.2)1.47 (1.27–1.71)
 In the last month216 (4.3)296 (7.5)1.81 (1.51–2.17)