Determinants of Bone Strength Estimated by Calcaneal Ultrasonography in Inuit Women from Nuuk (Greenland)

Table 2

Determinants of QUS parameters at the first measurement (2000).

Model^a
𝑁=118
SOS (log)year 2000  (m/s)^b
𝑅^2=0.2709
Variables	𝑅^2 partial	𝛽 coefficient (SE)	𝑃 value
Intercept	—	7.34480 (0.04531)	<0.0001
Height (cm)	0.1207	0.00035 (0.00022)	0.1077
Age (years)	0.0835	−0.00093 (0.00030)	0.0025
HRT use (Yes/No)	0.0281	0.00862 (0.00456)	0.0610
Weight (kg)	0.0190	0.00027 (0.00011)	0.0172
Ratio waist circumference/hip circumference	0.0196	−0.04157 (0.02396)	0.0856
BUAyear 2000  (dB/MHz)^b
𝑅^2=0.4029
Variables	𝑅^2 partial	𝛽 coefficient (SE)	𝑃 value
Intercept	—	48.71032 (20.93768)	0.0218
Height (cm)	0.2147	0.41009 (0.11485)	0.0005
Weight (kg)	0.1234	0.24673 (0.05054)	<0.0001
Age (years)	0.0309	−0.40096 (0.17109)	0.0209
Calcium supplements use (Yes/No)	0.0185	4.03632 (2.34922)	0.0885
HRT use (Yes/No)	0.0155	4.45645 (2.61774)	0.0915
SI (log)year 2000  (%)^b
𝑅^2=0.3657
Variables	𝑅^2 partial	𝛽 coefficient (SE)	𝑃 value
Intercept	—	3.56182 (0.33487)	<0.0001
Height (cm)	0.2065	0.00664 (0.00184)	0.0005
Weight (kg)	0.0734	0.00311 (0.00082)	0.0002
Age (years)	0.0614	−0.00840 (0.00275)	0.0028
HRT use (Yes/No)	0.0243	0.08752 (0.04208)	0.0398

aAutomatic selection of variables by the stepwise method (entry 𝑃 value of 0.10 and exit 𝑃 value of 0.15).
“Candidate” variables in the predictive model were age, height, body weight, waist circumference/hip circumference ratio, ratio omega-3/omega-6 PUFA (or % omega-6 PUFA), DL-PCB 156, total breastfeeding duration, menopausal status, oral contraceptive use, HRT use, smoking status, calcium supplement use, sun exposure, and consumption of dairy products (“candidate” variables were measured at baseline (year 2000) and all these variables in simple linear regression for QUS_{year 2000} models had a 𝑃 value ≤0.20).
^bThe same determinants were identified in a predictive model that comprised a greater number of “candidate” variables, for example, variables listed in note ^aplus eight variables with a 𝑃 value >0.20 in simple regression models. This model included only 101 participants for whom dataset was complete. “Candidate” variables in this predictive model were age, height, body weight, waist circumference/hip circumference ratio, % omega-6 PUFA, DL-PCB 156, total breastfeeding duration, menopausal status, oral contraceptive use, HRT use, smoking status, calcium supplement use, sun exposure, consumption of dairy products, and total cholesterol, total triglycerides, % omega-3 PUFA, personal history of fracture, LPA, CSO, parity, and alcohol intake. All “candidate” variables were measured at baseline (year 2000).