SPP1 and hip fracture: As shown in Table 4, increased serum levels of OPN and β‐CTX and a history of falling within 3 years were risk factors for hip fracture in the elderly (OR = 6.263 [2.608‐15.037], 31.296 [3.138‐312.125], 7.582 [2.702‐21.280], respectively).