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The Pearson ��2 and exact Fisher tests were used for testing differences in proportions between groups, and a Bonferroni test was performed to correct for multiple comparisons. Association between the haplotypes studied and CAG/GGN polymorphism lengths were calculated using Poisson's regression analysis. For testing http://www.selleckchem.com/products/Maraviroc.html differences in medians, the groups were compared by the Kruskal-Wallis test and by the Mann-Whitney test. The OR was used to estimate relative risk among different subsets of patients and controls, which was calculated by logistic regression analysis assigning the baseline genotype to haplotype 1. P values less than .05 (2-sided) were considered statistically significant. The sample size necessary to obtain an 80% statistical power and an �� value of .05 was calculated using the Power for Genetic Association Analyses software (Menashe et al, 2008). In agreement with the study of Saare et al (2008), the number of participants studied was sufficient to detect haplotypes associated with a 5.15-fold increased risk for primary spermatogenic failure and present in 5.25% of the population http://www.selleck.cn/products/Paclitaxel(Taxol).html (both conditions in 1 group). The most frequent allele for each of the 6 htSNPs studied in controls, idiopathic patients, and excryptorchidic patients is shown in Table 1. No significant differences were found in the frequency of each of these htSNPs among the groups. In addition, no significant differences were found when the patients were classified according to the type of spermatogenic failure http://www.selleckchem.com/products/pirfenidone.html (germ cell aplasia, severe atrophy, mixed atrophy, and hypospermatogenesis). A total of 10 haplotypes (HAP) formed by these 6 htSNPs were found in the study population of fertile and infertile men. Table 2 shows the combinations and frequencies of the five most represented haplotypes (HAP1�CHAP5), with the rest of the haplotypes (HAP6�CHAP10) grouped as ��others,�� given that each haplotype has a frequency below 2% in each analyzed group (control, idiopathic, and excryptorchidic). HAP1 was the most common in the total population (83.2%; P