Table 6

Chi-square tests of linkage disequilibrium between pairs of markers for spouses combined

Ethnicity

Site

Mean chi-square*

% (N) with P < 0.05

Mexican

Mexico City

1.80

0.146 (782)

Bay Area

1.47

0.105 (564)

All

3.27

0.152 (814)

Puerto Rican

Puerto Rico

1.95

0.161 (861)

New York

1.43

0.100 (534)

All

3.38

0.173 (925)

*Chi-square for single sites has 1 degree of freedom (df), expected value is 1.0; for two sites combined, df = 2 and expected value is 2.0.

Risch et al. Genome Biology 2009 10:R132   doi:10.1186/gb-2009-10-11-r132