Table 1.

Potential confounders included as covariates in main analyses and additional analysis

	Covariate	Register	Categories and ICD codes
Main analysis	Maternal age at child’s birth	Medical Birth Register	Continuous
	Birth order	Medical Birth Register	1, 2, ≥3
	Child’s sex	Medical Birth Register	Male, female
	Birth weight by gestational age	Medical Birth Register	SGA (birth weight below the 10th percentile for gestational age) AGA
			LGA (birth weight above the 90th percentile for gestational age)
	Highest attained parental education level	LISA/census in 1970a	Primary (less than 10 years of education)
			Secondary (10–12 years of education)
			Tertiary (more than 12 years of education)
	Child’s diabetes diagnoses before cancer diagnosis or before age 15 years	Swedish hospital inpatient register	ICD-8 and ICD-9, 250; ICD-10, E10, and E11
	Birth defects		ICD-9: 740-759; ICD-10: Q00-Q99
Additional analysis	Maternal smoking during pregnancyb	Medical Birth Register	None
			1–9 cigarettes/day
			≥10 cigarettes/day
	Pre-pregnancy BMIb	Medical Birth Register	Underweight, BMI <18.5 kg/m2
			Healthy weight, BMI 18.5–<25 kg/m2
			Overweight, BMI 25–<30 kg/m2
			Obese, BMI ≥30 kg/m2

Notes:

^aHighest attained parental education was taken from LISA for all parents included in LISA at any time between 1990 and 2014. For parents who were not included in LISA during this period we used information on education from the census in 1970.

^bData only available from 1983 onwards.

Abbreviations: ICD, International Statistical Classification of Disease and Related Health Problems; SGA, small for gestational age; AGA, appropriate for gestational age; LGA, large for gestational age; LISA, The Longitudinal Integration Database for Health Insurance and Labor Market Studies; BMI, body mass index.