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2017 ; 357
(ä): j2708
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Childhood intelligence in relation to major causes of death in 68 year follow-up:
prospective population study
#MMPMID28659274
Calvin CM
; Batty GD
; Der G
; Brett CE
; Taylor A
; Pattie A
; ?uki? I
; Deary IJ
BMJ
2017[Jun]; 357
(ä): j2708
PMID28659274
show ga
Objectives To examine the association between intelligence measured in childhood
and leading causes of death in men and women over the life
course.Design Prospective cohort study based on a whole population of
participants born in Scotland in 1936 and linked to mortality data across 68
years of follow-up.Setting Scotland.Participants 33?536 men and 32?229 women who
were participants in the Scottish Mental Survey of 1947 (SMS1947) and who could
be linked to cause of death data up to December 2015.Main outcome measures Cause
specific mortality, including from coronary heart disease, stroke, specific
cancer types, respiratory disease, digestive disease, external causes, and
dementia.Results Childhood intelligence was inversely associated with all major
causes of death. The age and sex adjusted hazard ratios (and 95% confidence
intervals) per 1 SD (about 15 points) advantage in intelligence test score were
strongest for respiratory disease (0.72, 0.70 to 0.74), coronary heart disease
(0.75, 0.73 to 0.77), and stroke (0.76, 0.73 to 0.79). Other notable associations
(all P<0.001) were observed for deaths from injury (0.81, 0.75 to 0.86), smoking
related cancers (0.82, 0.80 to 0.84), digestive disease (0.82, 0.79 to 0.86), and
dementia (0.84, 0.78 to 0.90). Weak associations were apparent for suicide (0.87,
0.74 to 1.02) and deaths from cancer not related to smoking (0.96, 0.93 to 1.00),
and their confidence intervals included unity. There was a suggestion that
childhood intelligence was somewhat more strongly related to coronary heart
disease, smoking related cancers, respiratory disease, and dementia in women than
men (P value for interactions <0.001, 0.02, <0.001, and 0.02,
respectively).Childhood intelligence was related to selected cancer
presentations, including lung (0.75, 0.72 to 0.77), stomach (0.77, 0.69 to 0.85),
bladder (0.81, 0.71 to 0.91), oesophageal (0.85, 0.78 to 0.94), liver (0.85, 0.74
to 0.97), colorectal (0.89, 0.83 to 0.95), and haematopoietic (0.91, 0.83 to
0.98). Sensitivity analyses on a representative subsample of the cohort observed
only small attenuation of the estimated effect of intelligence (by 10-26%) after
adjustment for potential confounders, including three indicators of childhood
socioeconomic status. In a replication sample from Scotland, in a similar birth
year cohort and follow-up period, smoking and adult socioeconomic status
partially attenuated (by 16-58%) the association of intelligence with outcome
rates.Conclusions In a whole national population year of birth cohort followed
over the life course from age 11 to age 79, higher scores on a well validated
childhood intelligence test were associated with lower risk of mortality ascribed
to coronary heart disease and stroke, cancers related to smoking (particularly
lung and stomach), respiratory diseases, digestive diseases, injury, and
dementia.