==== 1966 (aged 20 years) ====
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=== Responding Population ===

All eligible study members were contacted: 3,899 cohort members responded to the postal questionnaire.

|Provided information         |3,899|                        | | | | | |
|Cumulative total of deaths   |268  |                        | | | | | |
|Cumulative permanent refusals|7    |                        | | | | | |
|Temporarily living abroad    |39   |                        | | | | | |
|Cumulative emigrated         |333  |                        | | | | | |
|Failure to contact           |816  |                        | | | | | |
|                        | | | | | |
=== Data collection ===

A postal questionnaire was sent to administrators at technical and further education establishments attended by cohort members to ask about course attended. 

In this and other appropriate years a postal questionnaire was sent to university students in their final year to ask about courses attended, health and employment.

A postal questionnaire on marriage and fertility, health and employment was sent to all cohort members.
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=== Training for data collection ===

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

=== Study Member Interview/self-completion ===

  * Marital status and children
  * Accidents and medical appointments
  * Chest and cough trouble (MRC questionnaire on respiratory symptoms)
  * Employment history
  * Further Education
  * Smoking

=== University/College Students (final year students) ===

  * Details of training
  * Illness and medical appointments
  * Employment attitudes and aspirations

=== College ===

  * Student course record
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=== Questionnaires ===

  * {{ questionnaires : 1966_SM_h2.pdf|Form H2 }}  - Postal questionnaire to all study members
  * {{ questionnaires : 1966_FInalYr_T2.pdf|Form T2 }}  - Final year students at College
  * {{ questionnaires : 1966_college_Y7.pdf|Form Y7 }} - Colleges

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