Table 1.
Comparison of CPRD and DIN patient cohorts (%, (n))
| Variable | CPRD (n=11 302) | DIN (n=3462) |
|---|---|---|
| Age at diagnosis (years) | ||
| 18–55 | 5.3% (602) | NA |
| 56–65 | 23.3% (2631) | NA |
| 66–75 | 37.4% (4228) | NA |
| 75 and above | 33.9% (3841) | NA |
| Gender | ||
| Male | 55.3% (6247) | 47.4% (1641) |
| Female | 44.7% (5055) | 52.6% (1821) |
| Smoking | ||
| Current | 14.7% (1665) | 19.1% (661) |
| Ex-smoker | 43.9% (4962) | 27.2% (941) |
| Never smoked | 34.2% (3864) | 51.8% (1792) |
| Missing | 7.2% (811) | 1.9% (68) |
| Deprivation (IMD 2004 quintiles)* | ||
| 1 (most deprived) | 17.8% (2012) | 9.6% (333) |
| 2 | 19.9% (2253) | 14.9% (517) |
| 3 | 21% (2375) | 19.2% (664) |
| 4 | 23.1% (2613) | 22.0% (760) |
| 5 (least deprived) | 18.1% (2049) | 26.4% (915) |
| Missing | 0% (0) | 7.9% (273) |
| Year of diagnosis | ||
| 1997–1998 | 5.8% (658) | 12.1% (420) |
| 1999–2000 | 8.8% (996) | 15.8% (546) |
| 2001–2002 | 16.4% (1856) | 20.6% (714) |
| 2003–2004 | 29.2% (3303) | 25.1% (870) |
| 2005–2006 | 39.7% (4489) | 26.3% (912) |
| Medications (N) | ||
| 0–4 | 14.9% (1681) | 16.9% (586) |
| 5–9 | 29.4% (3319) | 38.1% (1318) |
| 10–14 | 28.2% (3188) | 24.4% (845) |
| 15–19 | 8.5% (956) | 9.6% (332) |
| 20 and above | 19.1% (2158) | 7.8% (269) |
| Missing | 0% (0) | 3.2 (112) |
| Prescribed β-blocker | ||
| No | 64.3% (7272) | 59.4% (2057) |
| Yes | 35.7% (4030) | 40.6% (1405) |
| Type of β-blocker | ||
| Atenolol | 73.0% (2943) | 75.2% (1057) |
| Propranolol | 11.0% (443) | 12.8% (180) |
| Other β-blocker | 16.0% (644) | 12.0% (168) |
*Based on patient postcode for DIN and practice postcode for CPRD.
CPRD, Clinical Practice Research Datalink; DIN, Doctors’ Independent Network; NA, not available.