Log rank Spearman’s correlation (rs) between intelligence quotient (IQ) and either age, homocysteine, or folate in 131 patients with Down’s syndrome (DS) and in two subgroups divided by IQ median (IQ = 40)
| Group | No of cases | Age | Homocysteine | Folate | |||
|---|---|---|---|---|---|---|---|
| rs | p value | rs | p value | rs | p value | ||
| All DS | 131 | −0.455 | <0.0001 | −0.329 | 0.0002 | 0.110 | 0.2111 |
| IQ⩾40 | 69 | −0.546 | <0.0001 | −0.167 | 0.1689 | 0.088 | 0.4705 |
| IQ<40 | 62 | −0.101 | 0.4285 | −0.269 | 0.0355 | 0.328 | 0.0104 |