if you knew more in depth how the study was conducted then perhaps we could accept it as valid.
Sure.
The 2013 UNICEF data study is based on
nationally representative surveys from all 29 countries where FGM/C is concentrated, including 17 new surveys undertaken in the last three years. It also includes
data from more than 70 other nationally representative surveys conducted over a 20-year period.
The the 2013 UNICEF data study builds on a number of reports that UNICEF has conducted on FGM/C since 2005.
The nationally representative data on FGM/C are mainly available from two sources: Demographic and Health Surveys (DHS) and Multiple Indicator Cluster Surveys (MICS).
Since 1984, DHS have been carried out about once every five years with technical support from ICF International (formerly Macro International) and funding from USAID. The surveys cover a range of
demographic and health issues in Africa, Asia and Latin America, among other regions, providing relatively comparable data on fertility, family planning, child health, morbidity, mortality and HIV/AIDS.
A module on FGM/C was developed for the first time for the 1989-1990 survey in the northern part of what was then known as Sudan. After a few years, the module was modified and has been included in DHS for 23 countries to date.
Since 1995, MICS have been conducted approximately every five years, resulting in more than 200 surveys in about 130 countries. The first module on FGM/C was included in the 2000 MICS in the Central African Republic, Chad and Sudan. The last two rounds of MICS (mainly conducted in 2005-2006 and again in 2009-2011) generated updated FGM/C data from 16 countries, including seven with no prior data (Djibouti, Gambia, Guinea-Bissau, Iraq, Sierra Leone, Somalia and Togo).
Still question the validity?