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Table 5 Multiple linear regression analysis results: Urine pH and acid excretion associations with change of BMD*

From: Low urine pH and acid excretion do not predict bone fractures or the loss of bone mineral density: a prospective cohort study

Bone Site:   Unadjusted estimate p-value Adjusted estimate p-value
Urine pH:
Femoral Neck Coefficient:
95% confidence interval:
aR2 :
0.0034
-0.0004 to 0.0073
0.003
0.08 0.0018
-0.0025 to 0.0062
0.086
0.41
Total hip Coefficient:
95% confidence interval:
aR2 :
0.0012
-0.0027 to 0.0051
0.001
0.54 0.0020
-0.0020 to 0.0066
0.096
0.29
Lumbar Spine Coefficient:
95% confidence interval:
aR2 :
0.0053
-0.0052 to 0.0111
0.003
0.07 0.0022
-0.0044 to 0.0089
0.026
0.51
Urine Acid excretion:
Femoral Neck Coefficient:
95% confidence interval:
aR2 :
-0.0001
-0.0002 to -0.00002
0.0062
0.026 -0.0001
-0.0002 to 0.00001
0.088
0.19
Total hip Coefficient:
95% confidence interval:
aR2 :
-0.0001
-0.0002 to 0.00005
0.001
0.26 -0.0001
-0.0002 to 0.0001
0.099
0.46
Lumbar Spine Coefficient:
95% confidence interval:
aR2 :
-0.0002
-0.0003 to -0.00001
0.005
0.041 -0.00002
-0.0002 to 0.0002
0.026
0.84
  1. *The following variables were included in the adjusted models to control for confounding: age, gender, family history of osteoporosis, body mass index (BMI), change in BMI, estrogen status, physical activity, calcium intake, vitamin D status, smoking, kidney disease, urine creatinine, thiazide diuretics, bisphosphonate use and baseline BMD.