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Table 4 Proportion of Patients in Each Category

From: Trends of obesity rates between primary total hip arthroplasty patients and the general population from 2013 to 2020

   # of patients (THA) % of patients (THA) # of patients (Annual Physicals) % of patients (Annual Physicals) P-value
Underweight (BMI < 18.5) 2013 5 (n = 832) 0.6 720 (n = 23,837) 3 < 0.001
2014 10 (n = 1,109) 0.9 1,097 (n = 39,341) 2.8 < 0.001
2015 18 (n = 1,379) 1.3 1,421 (n = 66,708) 2.1 0.035
2016 19 (n = 1,584) 1.2 2,085 (n = 99,086) 2.1 0.01
2017 18 (n = 1,709) 1.1 3,053 (n = 147,724) 2.1 0.003
2018 26 (n = 1,777) 1.5 3,797 (n = 214,520) 1.8 0.328
2019 20 (n = 1,547) 1.3 4,281 (n = 236,238) 1.8 0.127
2020 13 (n = 1,313) 1 3,965 (n = 212,464) 1.9 0.019
Obese (BMI ≥ 30) 2013 357 (n = 832) 42.9 3,853 (n = 23,837) 16.2 < 0.001
2014 441 (n = 1,109) 39.8 6,957 (n = 39,341) 17.7 < 0.001
2015 529 (n = 1,379) 38.4 13,945 (n = 66,708) 20.9 < 0.001
2016 595 (n = 1,584) 37.6 22,605 (n = 99,086) 22.8 < 0.001
2017 620 (n = 1,709) 36.3 36,671 (n = 147,724) 24.8 < 0.001
2018 657 (n = 1,777) 37 58,680 (n = 214,520) 27.4 < 0.001
2019 639 (n = 1,547) 41.3 65,527 (n = 236,238) 27.7 < 0.001
2020 541 (n = 1,313) 41.2 61,400 (n = 212,464) 28.9 < 0.001
Class I Obesity (BMI: 30–34.9) 2013 235 (n = 832) 28.2 2,505 (n = 23,837) 10.5 < 0.001
2014 286 (n = 1,109) 25.8 4,524 (n = 39,341) 11.5 < 0.001
2015 321 (n = 1,379) 23.3 8,867 (n = 66,708) 13.3 < 0.001
2016 326 (n = 1,584) 20.6 14,264 (n = 99,086) 14.4 < 0.001
2017 360 (n = 1,709) 21.1 22,823 (n = 147,724) 15.4 < 0.001
2018 395 (n = 1,777) 22.2 35,886 (n = 214,520) 16.7 < 0.001
2019 379 (n = 1,547) 24.5 39,801 (n = 236,238) 16.8 < 0.001
2020 319 (n = 1,313) 24.3 37,024 (n = 212,464) 17.4 < 0.001
Class II Obesity (BMI: 35–39.9) 2013 85 (n = 832) 10.2 851 (n = 23,837) 3.6 < 0.001
2014 97 (n = 1,109) 8.7 1,576 (n = 39,341) 4 < 0.001
2015 143 (n = 1,379) 10.4 3,303 (n = 66,708) 5 < 0.001
2016 173 (n = 1,584) 10.9 5,413 (n = 99,086) 5.5 < 0.001
2017 182 (n = 1,709) 10.6 8,860 (n = 147,724) 6 < 0.001
2018 164 (n = 1,777) 9.2 14,508 (n = 214,520) 6.8 < 0.001
2019 168 (n = 1,547) 10.9 16,358 (n = 236,238) 6.9 < 0.001
2020 145 (n = 1,313) 11 15,412 (n = 212,464) 7.3 < 0.001
Class III Obesity (BMI ≥ 40) 2013 37 (n = 832) 4.4 497 (n = 23,837) 2.1 < 0.001
2014 58 (n = 1,109) 5.2 857 (n = 39,341) 2.2 < 0.001
2015 65 (n = 1,379) 4.7 1,775 (n = 66,708) 2.7 < 0.001
2016 96 (n = 1,584) 6.1 2,928 (n = 99,086) 3 < 0.001
2017 78 (n = 1,709) 4.6 4,988 (n = 147,724) 3.4 0.007
2018 98 (n = 1,777) 5.5 8,286 (n = 214,520) 3.9 < 0.001
2019 92 (n = 1,547) 5.9 9,368 (n = 236,238) 4 < 0.001
2020 77 (n = 1,313) 5.9 8,964 (n = 212,464) 4.2 0.003