Menopausal hormone therapy, oral contraceptives and risk of chronic low back pain: the HUNT Study

Table 1 Descriptive statistics of potential risk factors for LBP at baseline in HUNT2, by use of systemic MHT or OC

	Use of systemic MHT^a			Use of OC^b
	Never	Former	Current	Never	Former	Current
Number of women included	8222	839	2011	7777	9695	2165
Age in HUNT2^c (year)	50.8	54.3	54.2	50.7	39.2	28.4
BMI^c (kg/m²)	26.5	26.7	26.2	26.6	25.4	24.6
Hard physical activity per week (hour) (%^d)
< 1	80	80	82	80	73	60
1–2	15	15	13	14	21	27
≥ 3	5	5	5	6	7	14
Cigarette smoking (%^d)
Never	39	37	37	45	38	56
Daily former	29	30	32	26	27	18
Daily current	32	34	31	29	35	27
Education (year) (%^d)
≤ 9	40	45	42	44	18	7
10–12	39	35	36	37	53	58
≥ 13	21	21	22	19	30	35
Age at menarche^c (year)	13.4	13.3	13.4	13.4	13.1	13.1
Nulliparity (%^d)	6	5	6	13	9	46
Age at first childbirth^c,e (year)	23.0	22.8	22.8	23.0	23.0	22.7

LBP Low back pain, HUNT Trøndelag Health Study, MHT Menopausal hormone therapy, OC Oral contraceptives, BMI Body mass index
^aAmong nonpregnant women aged 40–69 years with information about chronic LBP, BMI, physical activity, education, smoking, age at menarche, nulliparity, age at first childbirth, use of MHT and OC
^bAmong women aged 20–69 years with information about chronic LBP, BMI, physical activity, education, smoking, age at menarche, nulliparity, age at first childbirth, use of MHT and OC
^cMean value within category of use of MHT or OC
^dPercentages of risk factor categories within category of use of MHT or OC
^eAmong women with at least 1 child

ISSN: 1471-2474