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Table 1 Characteristics of included studies

From: Inverse relation of body weight with short-term and long-term mortality following hip fracture surgery: a meta-analysis

Authors Year Country Study design Total (% female) Mean age Underweight definition
Decease/total number (%)
Average weight definition
Decease/total number (%)
Obesity/definition
Decease/total number (%)
Mortality
Follow-up
Hazard ratio provided
Chaudhry et al. [24] 2021 USA Retrospective studies 104,468 (69%) NA BMI < 18.5 BMI: 18.5–24.9 BMI > 30 30 days No
       856/9292 (9.2%) 3421/49,916 (6.9%) 708/16,153 (4.8%)   
Müller et al. [26] 2020 Munich, Germany Retrospective single-center cohort study 950 (67.1%) 74.8 ± 13.51 BMI < 18.5 BMI: 18.5–25 BMI > 30 < 30 days No
       2/80 (2.5%) 17/570 (3%) 1/59 (1.7%)   
Pedersen et al. (transfuse) (non-transfused) [17] 2016 Denmark Prospective population-based study 10,527 NA BMI < 18.5 BMI: 18.5–25 BMI > 30 1 year Yes
       No data/5010 No data/25,639 No data/2889   
Prieto‐Alhambra et al. [22] 2014 Spain Retrospective population- based cohort study 6988 (71.3%) 79.3 ± 11.8 BMI < 18.5 BMI: 18.5–25 BMI > 30 1.17 (0.53–2.02) year Yes
       26/79 (32.9%) 308/1353 (22.8%) 187/1315 (14.2%)   
Solbakken et al. [21] 2017 Norway Matched cohort study 3177 (65%) 80.6 BMI < 18.5 BMI: 18.5–25 BMI > 30 2–9 years Yes
       59/76 (78%) 888/1372 (65%) 291/476 (61%)   
Kirkland et al. [25] 2011 Minnesota, USA Retrospective cohort chart review 485 (73%) 64–90 BMI < 18.5 BMI: 18.5–25 BMI > 30 30 days No, only odds ratio
       8/42 (19%) 19/241 (7.9%) 1/67 (1.5%)   
Kimura et al. [28] 2019 Kyushu, Japan Retrospective study 497 (78.5%) 80.1 ± 7.9 BMI < 18.5 BMI: 18.5–25 BMI >  = 25 1 year Yes
       26/158 (16.5%) 17/295 (5.7%) 2/44 (4.5%)   
Tahir et al. [18] 2020 Karachi, Pakistan Prospective study 490 (68.6%) NA BMI < 20 BMI: 20–25 BMI > 30   
       25/73 (34.2%) 40/146 (25.9) 17/117 (14.5%) 1 years No
       2/73 (2.7%) 2/146 (1.3%) 0/117 (0%) 30 days No
Akinleye et al. [23] 2018 USA Prospective study 15,108 (62%) 69.8–77 BMI < 20 BMI: 20–29 BMI > 30 30 days No
       196/2414 (8.12%) 552/10,734 (5.14%) 74/1960 (3.8%)   
Modig et al. [12] 2019 Sweden Prospective cohort Study 17,756 (68.3%) 82.7 ± 8.0 BMI < 22 BMI: 22–25 BMI > 30 1 year Yes
       1778/5986 (29.7%) 1253/5494 (22.8%) 222/1503 (14.8%)   
Flodin et al. [27] 2016 Stockholm, Sweden Prospective multicenter study 843 (73%) 82 ± 7 BMI < 22 BMI: 22–26 BMI > 26 1 year No
       58/364 (16%) 61/341 (18%) 9/138 (6%)   
  1. BMI body mass index