The Inconstancy of Human Sex Ratios at Birth

27 05 2010

To the Editor:

When human sex ratio (proportion male) at birth is categorized by some demographic variables (maternal age, paternal age, parity etc) it is, as confirmed by Ein-Mor et al (1) ‘remarkably constant.’ However I have adduced evidence that sex ratio shows substantial variation when it is categorized by selected other variables, e.g., adverse paternal chemical exposures (dioxin, dibromochloropropane, fungicides, methylmercury, vinclozolin, borates, alcohol and smoking); paternal pathology (HLA B 15 positivity, non-Hodgkin’s lymphoma, testicular cancer and hepatitis B status) and adverse paternal occupational exposures (professional driving or diving, astronaut and non-ionizing radiation) (2). Read the rest of this entry »


Re: Evaluation of high sensitivity C- reactive protein in comparison with C- reactive protein as biochemical serum markers in women with endometriosis

20 05 2010

To the Editor:

We read the article by Lermann et al. (1) with great interest. The aim of the study was to compare high-sensitivity C-reactive protein (hs-CRP) with CRP as a soluble serum marker for the diagnosis of women with endometriosis. There were no significant differences between hs-CRP and CRP levels in endometriosis, unknown endometriosis and non endometriosis. However, the authors reported that hs-CRP had positive correlations between CRP in endometriosis (also in all stages), unknown endometriosis and non endometriosis. Read the rest of this entry »

Are Chinese people really more fertile?

5 05 2010

To the Editor:

We congratulate Bilian et al. on an important contribution to the research informing day-specific probabilities of conception (1). However, we question their conclusion of an ethnic difference in fecundity. Over half of their female participants had a previous pregnancy (Table 1), and all of the men had clinically proven fertility, which selected for couples of substantially higher fecundity than the participants in the North Carolina Early Pregnancy Study (2). Read the rest of this entry »

Heterotopic pregnancy: is it really a rare event? The importance to exclude it not only after in vitro fertilization but also in case of spontaneous conception.

3 05 2010

To the Editor:

We read with interest the paper by Kamath et al. (1) which reported a case of ovarian heterotopic pregnancy after an in vitro fertilization (IVF) cycle. Read the rest of this entry »