Menarche in left handers

Abstract EN

Background: Though the left handers are a minority but it is a very big minority as it constitute about 8-15% of the population.

Many differences medical, social, behavioral and even in survival…etc., are found between right handers and left handers and one of the theories which is working is that left handers have a low potential for development than the other people who are programmed to be right handers and being a leftist is a way from normal. Objective: To study one of the important differences between Rt and Lt hander by exploring whether the Lt hander females have a low potential for development than the Rt one, and also to compare the proportion of Lt handers in our society with others elsewhere in the world. Subjects and Methods: This study was done from the period Oct.2005- June2006 by screening 292 female students in the Technical institute in (Abu-Garak).

In this study we consider the time of first menstruation as a marker for their development and we decided to call anyone who does not have a period until fourteen or older a slow–maturing female. Result: In this study we found that 31 female students out of 292 were left handers (10.6%).

Also we found 7 out of 31 Rt hander females were slow maturing (22.6 %), while 15 out of 31 Lt hander females were slow maturing (48.4%).

The average of Rt hander female that menstruated below 14 years age was (77.4%), While the average of Lt hander female that menstruated below 14 years age was (51.6%). Conclusion: This result can be interpreted that left handed women are developing physically at a slower rate than their right handed counterparts.

Also we found among those screened Rt handed females, menarche age was recorded at eleventh years old, while none was so in the other group.

The total average of Lt Hander was nearly similar to figures elsewhere in the world.

Though there are so many differences in the left handers but these differences doesn't mean that they are inferior to the right handers.

Cleverness, geniuses, sport heroes and famous painter all are seen among left handers.