Table 5. Results of the haplotype analysis for the genes COL9A1、COL9A2 and COL9A3.

Gene	Block	Haplotype	Controls (freq.)	Cases (freq.)	OR (95% CI)	P value
COL9A1	Block 1	AT	0.7909	0.7835	1.00	---
		GT	0.1087	0.1381	1.28 (0.87–1.89)	0.21
		GC	0.0982	0.0742	0.76 (0.49–1.19)	0.23
	Block 2	CTCTA	0.7083	0.7006	1.00	---
		TCTCG	0.0977	0.1146	1.16 (0.77–1.76)	0.48
		CCTCA	0.0543	0.0820	1.53 (0.92–2.54)	0.10
		CCCCA	0.0698	0.0547	0.80 (0.48–1.34)	0.40
		CCTCG	0.0248	0.0166	0.61 (0.25–1.48)	0.27
		CCCTA	0.0149	0.0010	0.62 (0.19–2.01)	0.43
	Block 3	AACA	0.6867	0.6660	1.00	---
		GACG	0.1718	0.2007	1.20 (0.86–1.66)	0.28
		GCTG	0.1395	0.1314	0.97 (0.67–1.40)	0.86
COL9A2	Block 1	GGCTGA	0.2963	0.3218	1.00	---
		GGCCGC	0.2614	0.2389	0.82 (0.59–1.15)	0.25
		GGTTTA	0.1502	0.1372	0.80 (0.53–1.20)	0.28
		GACTGA	0.1176	0.1114	0.83 (0.54–1.29)	0.42
		CGCCGC	0.0762	0.0891	1.08 (0.67–1.76)	0.74
		GGCCGA	0.0492	0.0375	0.66 (0.34–1.29)	0.22
		GGCTTA	0.0305	0.0370	1.00 (0.50–2.02)	0.99
COL9A3	Block 1	TT	0.5894	0.5500	1.00	---
		AT	0.2361	0.2817	1.29 (0.97–1.71)	0.086
		TC	0.1745	0.1683	1.06 (0.75–1.48)	0.74