Spearman rank correlation coefficients for comparison of standardised event ratios (ages 0–84) and age-specific rates for asthma from different data sources for region and urban/rural combinations in 1991 and regions in 1994
| GPRD: inhaler and asthma diagnosis# | HES: emergency admissions | Mortality: ages 0–84 | ||||
| 1991 | 1994 | 1991 | 1994 | 1991 | 1994 | |
| Ages 0–84 | ||||||
| HSE95: ages 2–84, symptoms of wheeze or whistling in the chest | −0.20 | 0.27 | 0.05 | |||
| GPRD: ages 0–84, inhaler prescription and asthma diagnosis# | −0.12 | −0.35 | 0.23 | −0.50 | ||
| HES: ages 0–84, emergency admissions | 0.32 | 0.48 | ||||
| Ages 5–14 | ||||||
| HSE95: symptoms of wheeze or whistling in the chest | 0.22 | −0.86 | ||||
| Ages 0–14 | ||||||
| GPRD: inhaler prescription and asthma diagnosis# | 0.15 | −0.06 | ||||
| Ages 15–84 | ||||||
| HSE95: Symptoms of wheeze or whistling in the chest | −0.22 | 0.67 | ||||
| GPRD: inhaler prescription and asthma diagnosis# | −0.24 | −0.29 | ||||
GPRD: General Practice Research Database
HES: Hospital Episode Statistics
HSE95: Health Survey for England 1995
#: patients who also had a diagnosis of chronic obstructive lung disease were excluded