==== 1955 (aged 9 years) ====
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=== Responding Population ===

The mothers of all eligible study members were contacted: 4,181 mothers of cohort members were interviewed.

|Provided information         |4,181|                        | | | | | |
|Cumulative total of deaths   |239  |                        | | | | | |
|Cumulative permanent refusals|1    |                        | | | | | |
|Temporarily living abroad    |40   |                        | | | | | |
|Cumulative emigrated         |275  |                        | | | | | |
|Failure to contact           |626  |                        | | | | | |
|

=== Data collection ===

School nurses and health visitors interviewed mothers at home about the child’s health, development and behaviour, school absences, the mother’s work, and the home and family circumstances; they also commented on the state of the dwelling.
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=== Training for data collection ===

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

=== Mothers ===

  * Accidents
  * Infectious diseases
  * Admissions to Hospital
  * School clinic and out patient department attendances
  * School Absences
  * Bed Wetting
  * General health and behaviour
  * The Mother's work
  * Schooling
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=== Questionnaires ===

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  * {{ questionnaires : 1955_mother_A5.pdf|Form A5 }} – Interview of mother by nurse
  * {{ questionnaires : School-Absences-195556-S4.pdf|Form S4 }} – School absence record (1955 – 1956)