Case Control Study
Copyright ©The Author(s) 2017.
World J Orthop. Feb 18, 2017; 8(2): 149-155
Published online Feb 18, 2017. doi: 10.5312/wjo.v8.i2.149
Table 1 Characteristic of symptomatic and asymptomatic lumbar osteoarthritis
CharacteristicCases (n = 44) median (interquartile range)Controls (n = 44) median (interquartile range)
Age (yr)58 (54-61)58 (53-60)
Length of menopause (yr)7 (4-10)8 (3-10)
Blood estrogen levels (pg/mL)12.7 (9.00-20.87)14.16 (9.51-19.23)
Body mass indexes (kg/m2)25.92 (23.27-28.06)25.28 (22.86-27.37)