==== 1977 (aged 31 years) ====
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=== Responding Population ===

All eligible study members were contacted via a postal questionnaire. Subsequently 238 study members were approached for a sub-study on the effect of breast feeding((See {{http://www.jstor.org/stable/25566180|Marmot MG et al.}} 1980 Journal of Epidemiology & Community Health, vol 34, pp 164-167 for further information))

|Provided information         |3,340|                        | | | | | |
|Cumulative total of deaths   |306  |                        | | | | | |
|Cumulative permanent refusals|158  |                        | | | | | |
|Temporarily living abroad    |77   |                        | | | | | |
|Cumulative emigrated         |528  |                        | | | | | |
|Failure to contact           |953  |                        | | | | | |
|
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=== Data collection ===

The postal questionnaire was sent to all cohort members to ask about family, health, employment, smoking, and sports participation and fitness.

Two physicians used a dietary and health questionnaire at home visits to 172 of 238 cohort members invited to take part in a study of the effect of breast feeding, and who had been selected on that basis.
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=== Training for data collection ===

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

=== All Study Members ===

  * Marital status and children
  * Information on parents
  * Accidents and medical appointments
  * Contraception (women only)
  * Employment history
  * Smoking
  * Heights and weights
  * Rheumatism and back pain
  * Headaches
  * Sports and fitness
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=== Questionnaires ===

  * {{ questionnaires : 1977_H6.pdf|Form H6 }} Postal questionnaire
  * {{ questionnaires : 1977_sub_dietary.pdf|Dietary Questionnaire }}  asked of 238 study members only. We do not hold the data for this\\