Table 3.
Summary of studies regarding the association between folate level and the risk of AD in five cohort studies.
|
Serum folate (nmol/L) |
References | Sample size |
Follow-up time (years) |
RR (95% CI) | Adjusted | NOS | Country |
|---|---|---|---|---|---|---|---|
| <13.5 | Wang et al., 2001 | 370 | 3 | 1.7 (0.9, 3.2) | YES | 6 | Sweden |
| Maxwell et al., 2002 | 226 | 5 | 2.17 (0.85, 5.53) | NO | 6 | Canada | |
| Ravaglia et al., 2005 | 816 | 4 | 1.98 (1.15, 3.40) | YES | 6 | Italy | |
| Middleton et al., 2007 | 233 | 5 | 1.91 (0.89, 4.11) | YES | 6 | Canada | |
| ≥13.5 | Quadri et al., 2005 | 190 | — | 1.8 (0.7, 4.5) | YES | 6 | Switzerland |