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. 2010 Oct;12(Suppl 1):S45–S50. doi: 10.1093/ntr/ntq038

Table 1.

Respondent characteristics for the three wave-to-wave transitions

Waves 1–2
Waves 2–3
Waves 3–4
n = 6,116 n = 4,974 n = 4,975
Age (years)
    M (SD) 43.3 (14.2) 44.7 (14.0) 45.5 (13.6)
Sex
    Female (%) 55.5 56.3 56.9
Country (%)
    Canada 24.9 26.7 25.1
    USA 19.8 21.3 22.0
    UK 27.9 25.6 26.1
    Australia 27.3 26.5 26.8