Table 2 Characteristics of the study population, stratified by successful matching
From: Epidemiology and cost of seasonal influenza in Germany - a claims data analysis
Variable | Level | Total sample | Cases (N = 95,089) | Controls (N = 95,089) | No matching partner found (N = 4911) | p-value for difference matched vs. unmatched |
|---|---|---|---|---|---|---|
Year | 2012 (%) | 25,223 (25.2%) | 23,702 (24.9%) | 23,702 (24.9%) | 1521 (31.0%) | < 0.001 |
2013 | 50,799 (50.8%) | 48,786 (51.3%) | 48,786 (51.3%) | 2013 (41.0%) | ||
2014 | 23,978 (24.0%) | 22,601 (23.8%) | 22,601 (23.8%) | 1377 (28.0%) | ||
Age in years | Mean (SD) | 34.01 () | 34.84 (19.58) | 34.84 (19.58) | 19.74 (20.53) | < 0.001 |
Age group | 0 to 1 (%) | 1935 (1.9%) | 1693 (1.8%) | 1693 (1.8%) | 242 (4.9%) | < 0.001 |
2 to 5 | 7755 (7.8%) | 6324 (6.7%) | 6324 (6.7%) | 1431 (29.1%) | ||
6 to 9 | 5415 (5.4%) | 4860 (5.1%) | 4860 (5.1%) | 555 (11.3%) | ||
10 to 17 | 9184 (9.2%) | 8405 (8.8%) | 8405 (8.8%) | 779 (15.9%) | ||
18 to 34 | 25,917 (25.9%) | 25,059 (26.4%) | 25,059 (26.4%) | 858 (17.5%) | ||
35 to 59 | 40,261 (40.3%) | 39,531 (41.6%) | 39,531 (41.6%) | 730 (14.9%) | ||
60 plus | 9533 (9.5%) | 9217 (9.7%) | 9217 (9.7%) | 316 (6.4%) | ||
Sex | Male (%) | 49,103 (49.1%) | 46,574 (49.0%) | 46,574 (49.0%) | 2529 (51.5%) | 0.001 |
Female | 50,897 (50.9%) | 48,515 (51.0%) | 48,515 (51.0%) | 2382 (48.5%) | ||
Category of insured persons | Employed (%) | 80,312 (80.3%) | 78,390 (82.4%) | 78,390 (82.4%) | 1922 (39.1%) | < 0.001 |
Self-employed | 3109 (3.1%) | 2581 (2.7%) | 2581 (2.7%) | 528 (10.8%) | ||
Unemployed | 4720 (4.7%) | 3770 (4.0%) | 3770 (4.0%) | 950 (19.3%) | ||
Social security beneficiary | 75 (0.1%) | 11 (0.0%) | 11 (0.0%) | 64 (1.3%) | ||
Student | 1453 (1.5%) | 1239 (1.3%) | 1239 (1.3%) | 214 (4.4%) | ||
Retired | 7766 (7.8%) | 7211 (7.6%) | 7211 (7.6%) | 555 (11.3%) | ||
Other | 2565 (2.6%) | 1887 (2.0%) | 1887 (2.0%) | 678 (13.8%) | ||
Pharmaceutical costs previous year | Mean (SD) | 311.74€ (2486.59€) | 255.63€ (1238.33€) | 256.14€ (1242.43€) | 2077.62€ (12,240.23€) | < 0.001 |