Table 1 Characteristics of patients diagnosed with postpartum thyroiditis (O905) in the North Denmark Region from 2016 to 2019 and in all regions of Denmark from 1997 to 2016.

	North Denmark region 2016–2019		All Danish regions 1997–2016
	n	%	n	%
Patients	40		1,105
Age^a
< 30 years	17	45.9	436	44.7
≥ 30 years	20	54.1	539	55.3
Smoking^a,b
Yes	5	13.5	99	10.4
No	32	86.5	856	89.6
Pre-pregnancy BMI^a
< 25 kg/m²	20	54.1	497	71.4
≥ 25 kg/m²	17	45.9	199	28.6
Parity^a
Nullipara	21	56.8	511	50.6
Multipara	16	43.2	499	49.4
Known thyroid disease	3	7.5	135	12.2
Non-thyroid autoimmune disease	< 3	NA	60	5.4

BMI Body mass index, NA Not applicable.
^aMissing data not included: Age (n = 133), smoking (n = 153), pre-pregnancy BMI (n = 412), parity (n = 98).
^bCurrent or previous smoking.

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