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1967 (aged 21 years)

Responding Population

All eligible study members were contacted

Provided information tbc
Cumulative total of deaths tbc
Cumulative permanent refusalstbc
Temporarily living abroad tbc
Cumulative emigrated tbc
Failure to contact tbc

Data collection

Postal questionnaire sent to parents of study member.

LHA do not hold this data+

Training for data collection

Not known


  • Use of glasses by parents and siblings of study member