Table 3

 Characteristics of subpopulation of non-smoking women in urban Liwang and rural Yunyan*

Urban Liwang(n = 985)Rural Yunyan(n = 824)Total(n = 1809)p Value (Liwang vsYunyan)
ETS, environmental tobacco smoke; BMI, body mass index; LPG, liquid petroleum gas.
*Data shown as number (%) of observations.
Age group (years)<0.001
    40–49321 (32.6)360 (43.7)681 (37.6)
    50–59239 (24.3)222 (26.9)461 (25.5)
    60–69276 (28.0)168 (20.4)444 (24.5)
    ⩾70149 (15.1)74 (9.0)223 (12.3)
Education (years)<0.001
    0126 (12.8)706 (85.7)832 (46.0)
    1–6330 (33.5)109 (13.2)439 (24.3)
    ⩾7529 (53.7)9 (1.1)538 (29.7)
ETS<0.001
    No440 (44.7)188 (22.8)628 (34.7)
    Yes545 (55.3)636 (77.2)1181 (65.3)
Occupational exposure to dust<0.001
    Yes244 (24.8)812 (98.5)1056 (58.4)
    No741 (75.2)12 (1.5)753 (41.6)
Respiratory disease in family0.097
    Yes185 (18.8)174 (21.1)359 (19.8)
    No800 (81.2)650 (78.9)1450 (80.2)
Cough in childhood<0.001
    Often/sometimes70 (7.1)11 (1.3)81 (4.5)
    Seldom915 (92.9)813 (98.7)1728 (95.5)
BMI (kg/m2)0.005
    <18.567 (6.8)33 (4.0)100 (5.5)
    18.5–23.9539 (54.7)537 (65.2)1076 (59.5)
    ⩾24.0379 (38.5)254 (30.8)633 (35.0)
Life quality<0.001
    Poor44 (4.5)247 (30.0)291 (16.1)
    General815 (82.7)558 (67.7)1373 (75.9)
    Good126 (12.8)19 (2.3)145 (8.0)
Fuel type<0.001
    LPG974 (98.9)1 (0.1)975 (53.9)
    Coal8 (0.8)82 (10.0)90 (5.0)
    Biomass3 (0.3)741 (89.9)744 (41.1)
Local exhaust ventilation in kitchen<0.001
    Yes888 (90.2)6 (0.7)894 (49.4)
    No97 (9.8)818 (99.3)915 (50.6)