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Table 2 Study quality of the included studies based on the Newcastle–Ottawa scale

From: Factors affecting the incidence of postoperative periprosthetic fractures following primary and revision hip arthroplasty: a systematic review and meta-analysis

  Author, year Representativeness of the exposed cohort Selection of the nonexposed cohort Ascertainment of exposure Demonstration that outcome of interest was not present at start of the study Comparability of cohorts on the basis of the design or analysis Assessment of the outcome Follow-up long enough for outcomes* Adequacy of follow-up of cohort** Total Quality
1 Sarvilinna et al. [19] 1 1 1 1 2 1 1 1 09 Good
2 Sarvilinna et al. [20] 1 1 1 1 2 1 0 0 08 Good
3 Sarvilinna et al. [21] 1 1 1 1 2 1 0 0 08 Good
4 Berend et al. [22] 1 1 1 1 2 1 1 1 09 Good
5 Cook et al. [23] 1 1 1 1 2 1 1 1 09 Good
6 Meek et al. [24] 1 1 1 1 2 1 0 1 08 Good
7 Zhang et al. [25] 1 1 1 1 2 1 0 0 07 Good
8 Savin et al. [26] 1 1 1 1 2 1 0 0 07 Good
9 Singh et al. [27] 1 1 1 1 2 1 1 1 09 Good
10 Singh et al. [28] 1 1 1 1 2 1 1 1 09 Good
11 Katz et al. [29] 1 1 1 1 2 1 1 1 09 Good
12 Thien et al. [30] 1 1 1 1 2 1 0 1 08 Good
13 Ricioli Jr et al. [31] 1 1 1 1 2 1 1 1 09 Good
14 Gromov et al. [32] 1 1 1 1 2 1 0 1 08 Good
15 Lindberg-Larsen et al. [33] 1 1 1 1 2 1 0 0 07 Good
16 Tamaki et al. [34] 1 1 1 1 2 1 0 0 07 Good
  1. *Follow-up more than 24 months
  2. **Lost to follow-up rate more than 10% is considered inadequate