The average age of first-time sex for those who said they ate breakfast every day as a middle school student was 19.4, while for those who skipped breakfast, the average age was 17.5.
"The fact that people can't eat breakfast may show something about their family environment," said Kitamura.
Sung Kong Hoe University professor Kang Sung-hyun, who participated in the study, said: 'Their appearance, such as the bare feet, suggest they were enslaved.'Due to a long-standing dispute over Japan's wartime sexual slavery, it became crucial to come up with evidence.
All of the artwork in this post was created by Mizuka Inaba.
One woman in a dirty blouse is seen talking to a Chinese officer, others stare nervously at the ground and one, who appears to be pregnant, gently touches her bump.
Until now, photographs and accounts from survivors - labelled 'comfort women' by Japanese forces - have been the only records of Korean sex slavery.
She speaks in an embarrassed murmur, constantly rubbing a rosary.
But as she continues, Lee’s gestures grow animated and angry, bearing mute witness to the violence and humiliation she endured for two years as a teenage captive at a Japanese military base. Her hands chop the air, grab her neck, clutch her stomach.