Example 1
Questionnaire: Lifestyle and Health of Mother (ALSPAC) question G2d
The response to ‘how long ago?’ is entered as a duration. The time period is for a specific event (stopped smoking), the period queried is continuous and the time period is sufficiently described (years and months).
Example 2
Questionnaire: 1980 Parental Interview (BCS) question A8b
Response to ‘How long did this situation last?’ is entered as a duration. The time period is for a specific event (living with only one parent figure), the period queried is continuous and the time period is sufficiently described (years and months).
Example 3
Questionnaire: 1980 Parental Interview (BCS) question C2b
Response to ‘Length of time since father/mother last in paid job’ is entered as a duration. The time period is for a specific event (not currently in paid job), the period queried is continuous and the time period is sufficiently described (years and months).