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. 2009 Dec 15;3(Suppl 7):S129. doi: 10.1186/1753-6561-3-s7-s129

Table 2.

HLA region association with rheumatoid arthritis and arthritis-related traits

		RA affection status		Anti-CCP		RFUW

Method	df	χ²Statistic^a	p-Value	χ²Statistic^a	p-Value	χ²Statistic^a	p-Value
Traditional PC analysis	53	556.274	4.8 × 10^-85	49.28	0.6197	77.432	0.0159
PC-based cluster analysis	188	789.007	1.4 × 10^-74	203.383	0.2098	297.838	5.7 × 10^-7

^aχ²statistic based on multi-df likelihood ratio test for number of PCs or clusters included in the full model vs. the null model (intercept only).