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The constituent ratios of different drug interventions in the two groups. Nt, no treatment; Bd, basic drugs (calcium carbonate and vitamin D3 tablets + calcitriol soft capsules); Ale, alendronate sodium and vitamin D3 tablets; Bd + Ale, alendronate sodium and vitamin D3 tablets + basic drugs; Zol, zoledronic acid injection; Bd + Zol, zoledronic acid injection + basic drugs.
