Skip to main content
. Author manuscript; available in PMC: 2011 Mar 24.
Published in final edited form as: JAMA. 2010 Mar 24;303(12):1173–1179. doi: 10.1001/jama.2010.312

Table 2.

Mean Differences in Weight (Kilograms)a over Any 3-Year Period,b According to Physical Activity Level, Women’s Health Study, 1992–2007

Physical Activity (MET-Hr/Week)c
Group <7.5 7.5–<21 ≥21 P, Trend P, Interaction
All women
  Model 1 0.15±0.04 0.12±0.04 Referent <0.0001 --
  Model 2 0.12±0.04 0.11±0.04 Referent <0.0001 --
Women, by aged <0.0001
  <55 yr (n=21,363)e 0.12±0.08 0.02±0.08 Referent 0.0005
  55 – 64 yr (n=9,699) 0.24±0.06 0.19±0.06 Referent <0.0001
  ≥65 yr (n=3,017) −0.09±0.07 0.07±0.07 Referent 0.13
Women, by BMId <0.0001
  <25.0 kg/m2 (n=17,475) 0.21±0.04 0.14±0.04 Referent <0.0001
  25 – 29.9 kg/m2 (n=10,516) −0.04±0.06 −0.04±0.06 Referent 0.56
  ≥30.0 kg/m2 (n=6,088) 0.16±0.14 0.13±0.16 Referent 0.50
Women, by smoking statusd 0.53
  Never smokers(n=17,692) 0.18±0.05 0.17±0.05 Referent <0.0001
  Former smokers (n=12,169) 0.06±0.06 0.05±0.06 Referent 0.04
  Current smokers (n=4,186) 0.15±0.15 0.12±0.16 Referent 0.11
Women, by menopausal statusd 0.04
  Premenopausal (n=9,821) 0.19±0.13 0.08±0.13 Referent 0.03
  Postmenopausal (n=17,762) 0.12±0.04 0.12±0.04 Referent <0.0001
a

Mean difference in weight ±SD, kg, compared with the referent group.

b

Interval during which weight change was assessed, mean ±SD = 2.88±0.41 yr.

c

See footnote to Table 1 regarding physical activity levels.

d

Model 1 adjusted for age, baseline weight, height, and time interval between weight assessments; model 2 additionally adjusted for race, education, smoking, menopausal status, hormone replacement therapy, hypertension, diabetes, alcohol consumption, and quintiles of intakes of total energy, saturated fat, and fruits and vegetables. Analyses according to subgroups of women all used estimates from Model 2.

e

Number of women in the group at baseline.