Age at menarche, age at menopause, reproductive years and risk of fatal stroke occurrence among Chinese women: the Guangzhou Biobank Cohort Study

Table 1 Baseline characteristics by age at menarche of participants in the GBCS

Characteristics	Overall	Age at menarche (years)
Characteristics	Overall	≤ 12	13	14	15	16	17	≥ 18
Number, n	16,504	1368	2662	2849	2787	2667	1720	2451
Age (years)^b	61.4	59.0	59.4	60.2	61.7	62.1	63.1	64.1
Hypertension, %^b	27.0	27.6	27.8	27.9	27.6	27.6	26.7	23.8
Diabetes, %^a	13.1	13.7	12.3	13.3	13.6	13.8	14.5	11.3
Dyslipidaemia, %^b	85.7	87.4	87.6	86.8	85.9	85.2	84.2	82.7
BMI (kg/m²)^b	23.8	24.3	23.9	23.8	23.8	23.8	23.8	23.6
Good/very good self-rated health, %^c	82.7	82.6	83.5	83.0	82.5	82.5	81.2	82.8
Oral contraceptive pill use (ever), %^b	17.8	17.6	18.9	19.7	17.4	19.0	16.7	14.2
Current smoker, %^b	1.9	2.0	1.7	1.5	1.7	2.5	1.6	2.3
Current drinking, %^b	20.6	26.4	23.0	22.2	19.9	18.6	18.1	17.5
Active physical activity, %^c	52.6	52.1	53.0	52.2	50.9	52.2	54.1	54.1
Education ≤ primary, %^b	49.9	31.5	33.3	38.6	50.0	58.2	65.1	71.8
Manual job, %^b	54.5	43.3	47.1	47.7	54.8	58.3	62.2	66.6
Family income < 30,000 CNY/year, %^b	38.3	33.5	34.9	35.0	38.0	41.6	43.7	41.3
Number of children born > 3, %^b	21.4	8.6	10.9	13.2	21.2	26.5	31.8	36.7
Age at menopause (years)^b	49.5	49.0	49.4	49.6	49.6	49.6	49.5	49.5
Reproductive years (years)^b	34.3	37.2	36.4	35.6	34.6	33.6	32.5	30.9

^aP < 0.05; ^bP < 0.01; ^cP > 0.05; hypertension: systolic blood pressure, ≥ 140 mmHg, diastolic blood pressure, ≤ 90 mmHg, medication or diagnosed; diabetes: fasting blood glucose ≥ 7 or medication or diagnosis; dyslipidaemia: total cholesterol ≥ 5.2 mmol/L, triglyceride ≥ 1.7 mmol/L, low density lipoprotein ≥ 3.4 mmol/L, high density lipoprotein < 1.0 mmol/L, medication or diagnosis; BMI body mass index

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