Early birth linked to higher risk of hospital visits: BMJ study(Twitter/BoboBaby_Pro)
Early birth linked to higher risk of hospital visits: BMJ study(Twitter/BoboBaby_Pro)

Babies born extremely preterm are at the greatest risk of hospital admission throughout childhood: Study

A new study has revealed that preterm birth is a strong predictor of childhood illness but the risk declines as these children grow up. However, it remains unclear at what age this begins to happen and how these changes vary by week of gestational age at birth
By Press Trust of India | Posted by Zarafshan Shiraz | London
UPDATED ON NOV 27, 2020 08:46 AM IST

Being born before 37 weeks’ gestation is associated with a greater risk of hospital admission throughout childhood than being born at full term, says an observational study published in The BMJ on Thursday.

Infections were the main cause of excess hospital admissions at all ages, but particularly during infancy, the researchers said, adding respiratory and gastrointestinal conditions also accounted for a large proportion of admissions during the first two years of life.

The researchers, including those from University of Oxford, UK, said their findings indicate that gestational age at birth “is a strong predictor of childhood illness, with those born extremely preterm being at the greatest risk of hospital admission throughout childhood.” Although the risk declined as the children grew up, particularly after age 2, an excess risk remained up to age 10, even for children born at 38 and 39 weeks’ gestation, representing many potentially vulnerable children, they said.

Existing evidence suggests that the risk of illness associated with preterm birth declines as children grow up, but it remains unclear at what age this begins to happen and how these changes vary by week of gestational age at birth.

The researchers examined the association between gestational age at birth and hospital admissions to age 10 years and how admission rates change throughout childhood.

Their findings are based on data from more than 1 million children born in NHS hospitals in England between 1 January 2005 and 31 December 2006.

Children were monitored from birth until March 31, 2015 -- an average of 9.2 years per child -- during which time the researchers analysed numbers of hospital admissions.

Gestational age at birth was analysed in weeks, from less than 28 up to 42 weeks. Over 1.3 million hospital admissions occurred during the study period, of which 831,729 (63 per cent) were emergency admissions.

Just over half (525,039) of children were admitted to hospital at least once during the study period.

After taking account of other potentially influential risk factors, such as mother’s age, marital status and level of social deprivation, and child’s sex, ethnicity and month of birth, the researchers found that hospital admissions during childhood were strongly associated with gestational age at birth.

The hospital admission rate during infancy in babies born at 40 weeks was 28 per 100 person years -- this figure was about six times higher in babies born extremely prematurely (less than 28 weeks), the researchers said.

By the time the children were aged 7-10 years, the hospital admission rate in children born at 40 weeks was 7 per 100 person years -- this figure was about three times higher in those born at less than 28 weeks, they said.

However, even children born a few weeks early had higher admission rates, according to the researchers.

Being born at 37, 38, and 39 weeks’ gestation was associated with a difference in the rate of admission of 19, 9, and 3 admissions per 100 person years during infancy, respectively, compared with those born at 40 weeks.

The risk of hospital admission associated with gestational age decreased over time, particularly after age 2. However, an excess risk remained up to age 10, even for children born at 38 and 39 weeks’ gestation.

Although this excess risk at 38 and 39 weeks was relatively small, the large number of babies born globally at these gestational ages suggests that they are likely to have a large impact on hospital services, the researchers said.

This is an observational study, so can’t establish cause, and the researchers point to some limitations, such as being unable to take account of several factors that can impact child health like maternal smoking and breastfeeding.

However, they said this was a large study using routinely collected data over a 10 year period, and the findings remained relatively stable after further analyses, suggesting that the results withstand scrutiny.

(This story has been published from a wire agency feed without modifications to the text. Only the headline has been changed.)

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