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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)