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Luo Yan and her husband are above average height, but their two daughters, ages 9 and 10, are no taller than many of their classmates.
Early last month, Luo took the girls to a Shanghai hospital to inquire if they needed to use a growth hormone.
Li Pin, a pediatric endocrinologist, checked the bone ages and sex hormone levels of the girls, who are 135 centimeters and 149 centimeters tall, respectively, and told their mother that their genetic heights are both 167 centimeters and there is no need for them to have a growth hormone injection.
Bone age is a measure of the degree of skeletal maturity of a child, while genetics play a key role in determining height, which as a general rule is based on how tall a person’s parents are.
Li finally managed to persuade Luo to abandon the idea of growth hormone injections after telling her both girls are growing normally and healthily. They do not have any signs of sexual precocity — the onset of secondary sex characteristics at an earlier age than expected, typically before age 6 to 8 in girls, or 9 in boys.
Pediatric endocrinologists, including Li, said they are frequently consulted by parents such as Luo, whose children are not short compared with their peers and who are not expected to be short as adults. The parents simply want them to grow taller.
Li, director of the endocrinology department at the Children’s Hospital of Shanghai, said, “If we ask the parents how tall they want their sons to be, most of them say 175 centimeters is the bottom line, but some say it’s 180 centimeters.
“Children’s height has become an issue that has triggered parental concern, in addition to the academic performances of offspring. Everybody wants a perfect child and nobody wants their child’s height to be below average,” she said.
Doctors said the National Health Commission’s Women’s and Children’s Department calculates the average height of children at different ages every decade. Those whose heights fall below a 3% average on the national health chart are considered short.
Li said: “Chinese are growing taller in general, but there are always people below the 3% line. Medically speaking, males taller than 1.60 meters and females reaching 1.50 meters are deemed healthy, but some parents are not satisfied with this.”
A paper published in The Lancet medical journal last year about height and obesity trends in teenagers said Chinese were the tallest such group in East Asia, surpassing their counterparts in Japan and South Korea.
Over the past 35 years in China, the average height of 19-year-old males has risen by 8 centimeters to 175.7 centimeters, while the average height of females of the same age had risen by 6 centimeters to 163.5 centimeters.
However, a survey released by Health Times and Beijing Children’s Hospital in December found that nearly 66% of parents said they thought their children were short.
Job opportunities
Although in medical terms those below the 3% average are considered short, doctors said many children that are taken to hospitals fall below the 20% average in the national health chart, adding that numerous teenagers are fixated with their stature.
According to local media reports, at the start of the new semester in September, Xishan Senior Middle School in Wuxi, Jiangsu Province, asked a new intake of students to complete forms requiring their basic information.
According to the details provided, the average height of boys was 180.9 centimeters, while for girls, it was 166 centimeters. But these figures were later found to be 7.6 centimeters and 4.1 centimeters taller respectively than the actual heights, meaning the students had exaggerated their stature when completing the forms.
Children who have reached puberty, and their parents, believe that stature, an important part of appearance, is a factor in social interaction.
Luo, the mother from Shanghai, said: “Height will largely affect my daughters’ job opportunities in the future. Some university departments, including ocean navigation and hotel management, have height requirements for applicants.”
She said she had seen reports in China and overseas stating that a person’s stature has a direct bearing on their income.
In 2014, a survey in Sweden found that when a man gains 10 centimeters in height, his income rises by 6%.
Han Jun, the father of a 6-year-old boy from Changzhou, Jiangsu Province, who sought medical advice on the height of his son, said difficulty in finding a partner in the future would be a key concern for the boy if he was not tall enough.
“Most women prefer tall, handsome men. For our generation, it’s hard for men shorter than 170 centimeters to find a girlfriend, and for the next generation, the bar will be set even higher,” Han said.
Medical change
Experts said they believed the increased parental concern over children’s height also stems from evolving child diseases in recent decades.
Wang Xiumin, a pediatrician specializing in endocrinology at United Family Healthcare in Shanghai, said respiratory and digestive diseases as well as injuries (resulting from insufficient care in families with several children) used to account for more than 90% of child diseases clinically, but this has changed in the 21st century.
The social environment has changed greatly, along with children’s diets and lifestyles, and these factors have led to cases of sexual precocity rising significantly.
“The number of cases related to children’s growth and development account for roughly 20% of the total number of child diseases at large medical institutions in China,” Wang said.
“Now, the parents of some 30,000 children are seeking medical advice and treatment each year at grade A tertiary hospitals in Shanghai for their off-springs’ growth and development. This is a rise of 260% compared with five years ago, and 500% compared with 10 years ago,” she said.
In 2017, statistics from Peking University’s School of Public Health showed that the incidence of child obesity had doubled in a decade, and the prevalence of sexual precocity rose threefold over the past 10 years.
“In the past, people used to hope to remain disease-free, but now, with the general rise in living conditions, they want far more than just to be healthy,” Wang said.
She added that the increased parental focus on children’s height is also the result of more attention being paid to minors’ health and growth, which in turn will produce a healthier adult population.
“Advances in medical development and the increased awareness of diseases among the public will certainly result in hospitals seeing more patients in areas where there is disease,” she said.
Li said: “We hope those unsatisfied with their height come to hospitals earlier. Typical examples at my clinic involve 13- or 14-year-old boys in middle adolescence, but in such cases there is limited scope for doctors to change the situation.”
