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Table 5 Comparison of National Medical Register (ICD-9 codes*) and medical record research with regard to registered complications

From: Hospitalization due to varicella in the Netherlands

Complications National Medical Register (LMR)
Medical record research 052.0
N
052.1
N
052.7
N
052.8
N
052.9
N
Total
N
Complication
registered N (%)
Neurological        
Cerebellitis, ataxia 2 - 6 - 1 9 4 (44.4%)
Febrile convulsion - - 2 2 18 22 17 (77.3%)
Convulsion without fever - - - - 1 1 1 (100.0%)
Meningitis/encephalitis - - 1 1 5 7 3 (42.9%)
Cerebral vasculitis/infart/bleeding - - 1 - - 1 1 (100.0%)
Lower respiratory tract        
Pneumonia - 9 2 2 9 22 17 (77.3%)
Bronchitis or bronchiolitis - - 1 1 4 6 a 4 (66.7%)
Upper respiratory tract, ENT and eye        
Otitis media - - 4 1 11 16 6 (37.5%)
Faryngitis/tonsillitis - - 1 - 9 10 5 (50.0%)
Conjunctivitis - - 3 - 4 7 1 (14.3%)
Skin/subcutis        
Bacterial super infections of skin lesions - - 28 9 45 82 b 50 (61.0%)
Staphylococcal scalded skin syndrome - - - - 1 1 1 (100.0%)
Erythema multiforme exsudativum - - - - 1 1 0 (0.0%)
Necrotizing fasciitis - - - 1 - 1 0 (0.0%)
Gastrointestinal tract        
Gastroenteritis - 2 5 1 13 21 12 (57.1%)
Stomatitis - - 2 1 10 13 c 9 (69.2%)
(Imminent) dehydration - - 8 4 45 57 26 (45.6%)
Liver disorder - 1 - 1 - 2 1 (50.0%)
Secondary bacterial infections        
Sepsis - - 2 1 3 6 1 (16.7%)
Osteomyelitis - - 1 - - 1 1 (100.0%)
Bacterial arthritis - - 2 - 2 4 3 (75.0%)
Haematological/coagulation disorders        
Thrombocytopenia - 1 - 1 3 5 1 (20.0%)
Coagulation disorder - - - 2 1 3 1 (33.3%)
Leuco- and/or erythrocytopenia/anaemia - 1 2 2 3 8 2 (25.0%)
Other complications        
Reactive arthritis - - - - 1 1 1 (100.0%)
Other - 1 4 - 10 15 10 (66.7%)
Total 2 11 51 17 215 296  
  1. * ICD-9 code: 052.0 = postvaricella encephalitis, 052.1 = varicella (hemorrhagic) pneumonitis, 052.7 = varicella with other specified complications, 052.8 = varicella with unspecified complication, 052.9 = varicella without complication
  2. a acute upper respiratory infections registered in LMR were also included
  3. b all bacterial infections (also when it was not clear that it concerned the skin) registered in LMR were included
  4. c volume depletion disorder and feeding difficulties and mismanagement, registered in LMR were also included (except for patients for whom (imminent) dehydration was mentioned by the medical student as well)