Table 1. Characteristics of Female Participants According to Blood Pressure Status From 5 027 731 Couples
VariablesNormotensiveHypertensiveP Value
N4 933 18194 550···
Age, y<0.0001
20 to 241 971 069 (39.96)26 787 (28.33)
25 to 291 979 067 (40.12)32 639 (34.52)
30 to 34664 997 (13.48)17 964 (19.00)
35 to 39231 436 (4.69)10 543 (11.15)
≥4086 612 (1.76)6617 (7.00)
Nationality, n (%)<0.0001
Han4 332 198 (88.95)80 695 (86.21)
Others538 388 (11.05)12 903 (13.79)
Urban inhabitants, n (%)396 603 (8.04)8743 (9.25)<0.0001
Higher education, n (%)1 568 691 (32.7)25 961 (28.17)<0.0001
Marriage duration (y)a, median (IQR)1 (0–4)3 (0–7)<0.0001
BMI (kg/m2)<0.0001
Underweight (<18.5)642 793 (13.05)7944 (8.42)
Normal weight (18.5‐)3 488 821 (70.84)50 805 (53.86)
Overweight (24.0‐)640 849 (13.01)22 773 (24.14)
Obese (28.0‐)152 525 (3.10)12 812 (13.58)
Alcohol consumption, n (%)144 316 (2.93)3658 (3.88)<0.0001
Smoking amount (cigarettes per day), n (%)<0.0001
04 918 004 (99.69)93 974 (99.39)
1 to 57889 (0.16)264 (0.28)
6 to 104628 (0.09)189 (0.20)
11 to 152532 (0.05)121 (0.13)
Duration of second‐hand smoking exposure (minutes/day), n (%)<0.0001
04 399 820 (95.73)80 461 (93.25)
1 to 15124 287 (2.70)3199 (3.71)
≥1672 153 (1.57)2622 (3.04)
Smoking status of couples, n (%)<0.0001
Neither‐smoker3 531 347 (71.58)61 343 (64.88)
Husband‐only1 386 657 (28.11)32 631 (34.51)
Wife‐only4189 (0.08)172 (0.18)
Mixed10 988 (0.22)404 (0.43)
Husband smoking amount (cigarettes per day), n (%)<0.0001
03 535 536 (71.67)61 515 (65.06)
1 to 5339 318 (6.88)7076 (7.48)
6 to 10609 206 (12.35)13 310 (14.08)
11 to 15113 207 (2.29)2700 (2.86)
16 to 20313 259 (6.35)8968 (9.48)
≥2122 655 (0.46)981 (1.04)
Cumulative exposure of husband smoking (pack‐marriage years)b, n (%)<0.0001
03 750 871 (84.89)65 502 (76.7)
0.1 to 2.0376 222 (8.51)8350 (9.78)
2.1 to 4.0141 110 (3.19)4186 (4.90)
4.1 to 6.065 963 (1.49)2366 (2.77)
6.1 to 8.031 813 (0.72)1432 (1.68)
>8.052 537 (1.19)3568 (4.18)
  • BMI indicates body mass index; IQR, interquartile range.

  • a Duration of marriage was defined as the interval years between marriage year and the examination year.

  • b Pack‐marriage years were used to evaluate the cumulative exposure of spouse smoking, calculated by multiplying the number of packs of cigarettes husband smoked per day by the number of marriage duration.