I personally don't trust any reports and studies that comes from Non-muslims. How do we trust them when they lie so much? Whether be muslims or non muslims I can't trust a liar. It is common experience and observation that there are more women than men in the world. Look around yourself, look in your family. There is hadith that towards the end of times, there will be 1:50 ratio btw men and women. It won't happen overnight will it?