Table 2 Number and types of misclassification errors

Types of errors in registry

n

Dose not entered in registry

1

History of varicella disease not entered in registry

4

Fewer doses required due to age at first dose, but not noted in registry

2

Doses given out of region, but not entered in registry

5

Child moved from another province and considered complete by other province’s schedule, but not noted in registry

4

Subtotal

16

Types of errors in parent reporting

n

Parent reported child UTD, although:

Missed dose(s) (unexplained intentional or unintentional misreporting)

25

Refused varicella vaccine

6

Did not complete immunizations until after received survey

11

Parent reported child not UTD, although actually complete (unexplained intentional or unintentional misreporting)

2

Subtotal

44

Total number of errors from all sources

60