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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