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. 2015 Jul 5;128(13):1748–1754. doi: 10.4103/0366-6999.159348

Table 4.

Distribution of mtDNA haplogroups after stratification by AAO (EOPD vs. CT1)

Haplogroup* EOPD (n = 63) n (%) CT1 (n = 118) n (%) P Logistic regression analysis

OR 95% CI P
A 4 (6.3) 5 (4.2) 0.792 1.665 0.424–6.534 0.465
B 5 (7.9) 31 (26.3) 0.003 0.225 0.082–0.619 0.004
C 1 (1.6) 3 (2.5) 1.000 0.674 0.067–6.755 0.737
D 14 (22.2) 14 (11.9) 0.066 2.083 0.918–4.726 0.079
F 14 (22.2) 18 (15.3) 0.242 1.701 0.765–3.779 0.192
G 2 (3.2) 1 (0.8) 0.577 3.271 0.286–37.452 0.341
Others 23 (36.5) 46 (39.0) 0.744 0.905 0.477–1.718 0.760

*Fisher’s exact test for the overall haplogroup distribution: P = 0.023; P values for 2 × 2 tables; P < 0.05. mtDNA: Mitochondrial DNA; AAO: Age at onset; EOPD: Early-onset Parkinson’s disease; CT1: Control team 1; OR: Odds ratio; CI: Confidence interval.