Studies have found.
Girls in single sex schools are less likely to misbehave in class that they would in co ed, according to ESRI Professor Emer Smyth.
"But that's the only difference we have," she said.
The evidence shows that the academic outcomes of Single sex and Co- Ed schools comes back to the individual schools.
ESRI Professor Emer Smyth commented:"It's important to put evidence into the discussion and debunk some of the myths.
"People claim that girls do better in single sex schools, but when we compare like for like there is very little difference in academic outcome.
"There are really strong gender differences in education, as there is in every day life.
"We see differences in how they get on in school, its a much bigger issue than the school they attend," she insisted.
"Single sex schools, do draw on a more middle class distribution of young people and do tend to have higher achievements," she added.
Richard Daly, Principal Athy Community College commented: "Today the philosophy for our school is that we welcome all genders.
"As they go through puberty they get very confused.
"It's not even as simple as boys and girls schools.
"There is a cohort that mix together and then there are some groups of boys that stick together and boys.
"It happens organically just like you would see if you went out to a restaurant," he said.
Brenda Kearns, Principal, Salesian College Celbridge commented: "I would agree that the ethos of the school is really important, whether they are male of female.
"For a certain amount of the day they are with boys, but outside the school gate they are mixing with the opposite sex.
"The fundamental foundation of the school is what makes our school.
"We expect manners and respect, and boys do bring a boisterous element," she added.
Richard and Brenda spoke with Clem Ryan on Tuesday morning's Kildare Today:
ESRI Professor Emer Smyth spoke about the differences and between same sex and co- ed schools: