Table 1.

Weighted characteristics of study sample non-aspirin users and low-dose aspirin users (Group1: Total femur BMD, Femoral neck BMD, Intertrochanter BMD).

	Non-aspirin use (n = 353)	Low-dose aspirin use (n = 855)	P value
Total femur BMD (gm/cm2)	0.925 ± 0.149	0.946 ± 0.167	0.037
Femoral neck BMD (gm/cm2)	0.756 ± 0.132	0.774 ± 0.151	0.053
Intertrochanter BMD (gm/cm2)	1.099 ± 0.174	1.126 ± 0.198	0.030
BMI (kg/m2)	29.13 ± 5.15	30.03 ± 5.86	0.012
Hba1c (%)	6.01 ± 1.26	6.24 ± 1.08	0.002
Serum creatinine(mmol/L)	83.29 ± 23.64	83.62 ± 30.23	0.852
Serum uric acid (umol/L)	328.27 ± 77.46	329.13 ± 80.70	0.864
Gender (%)			0.464
Male	59.73	57.45
Female	40.26	42.54
Age (years)	63.07 ± 8.39	65.78 ± 8.51	< 0.001
Age groups (%)			< 0.001
50–60 years	37.44	27.67
60–70 years	40.50	36.25
70–80 years	22.04	36.07
Race (%)			0.096
Mexican American	5.55	4.29
Other Hispanic	8.79	5.23
Non-Hispanic White	69.69	71.43
Non-Hispanic Black	9.70	10.44
Other race-including multi-racial	6.25	8.59
Heart attack (%)			< 0.001
Yes	5.73	16.57
No	94.26	83.38
Recorded		0.04
Education level (%)			0.011
Less than high school	10.11	11.77
High school	27.41	35.96
More than high school	62.47	52.21
Recorded		0.03
Fractures (%)			0.001
Yes	35.73	25.40
No	64.19	74.47
Recorded	0.07	0.12
Smoking status (%)			0.00
Every day	16.04	10.18
Some days	4.03	1.25
Not at all	33.55	35.24
Recorded	46.36	53.31

Mean ± SD for continuous variables: P value was calculated by the weighted linear regression model.

Per cent for categorical variables: P value was calculated by weighted chi-square test. Weights are created in NHANES to account for the complex survey design (including oversampling), survey non-response, and post-stratification adjustment to match total population counts from the Census Bureau.