==== 1971 (aged 25 years) ====
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=== Responding Population ===

All eligible study members were contacted.

|Provided information         |3,307|                        | | | | | |
|Cumulative total of deaths   |286  |                        | | | | | |
|Cumulative permanent refusals|124  |                        | | | | | |
|Temporarily living abroad    |70   |                        | | | | | |
|Cumulative emigrated         |436  |                        | | | | | |
|Failure to contact           |1,139|                        | | | | | |
|
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=== Data collection ===

A postal questionnaire was sent to all cohort members to ask about marriage, fertility, health, smoking, employment, training and further education and earnings. Health visitors attempted contacts and data collections with non-respondents.
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=== Training for data collection ===

Instructions are given at the head of each form.
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=== Contents  ===

  * Marital status and children
  * Accidents and medical appointments
  * Chest and cough trouble (MRC questionnaire on respiratory symptoms)
  * Employment history and earnings
  * Use of government schemes to find employment
  * Further education
  * Smoking
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=== Questionnaires ===

  * {{ questionnaires : 1971-H5.pdf|Form H5 }} - Postal Questionnaire