Although this is only a 0.3% difference, which might appear small, it translates to an extra 1100 male births.
From our statistical analysis, it is highly likely that this increased birth rate nine months after the tournament was not a coincidence.
When there is stress due to natural events such as earthquakes, floods or man-made events such as terrorist attacks, fewer male babies on average are born, showing a decreased sex ratio at birth.
When there are no events adding stress to people, more male babies than female babies are born alive. Between February and March 2011 – nine months after the World Cup – the proportion of boys born compared to girls was 50.6%.
A letter sent to one of the suspended girls' parents is said to have read: "You have been found guilty of physical contact of a sexual nature with another pupil on campus, harassment, bullying other girls on campus and of being dishonest by not telling investigators the whole truth".
"It is because they contravened the school's code of conduct," said Lisa Halliday.
Facilities at the high-security campus include a theatre, computer and science laboratories and a library, and the curriculum aims to empower students to become leaders of their society.
As well as a high-level education, the TV host's academy provides free food, uniforms and learning materials for its underprivileged intake.
The sex ratio at birth can be used to assess the stress a population is under.
Miss Winfrey said: "Indiscretions resulting in disciplinary action are common in schools all over the world.
Unfortunately, because of my name these common infractions place the Academy in the media spotlight.
As each of the girls enrolled, she agreed to adhere to the school’s Honor Code and Code of Conduct policy, which values personal integrity and ensures an environment of shared trust and community.
I’m disappointed that several of our students chose to disregard the school’s rules.