Table 2. Magnitude of Changes in Mean BRI for Subsequent National Health and Nutrition Examination Survey Cyclesa .
| Survey years | BRI | Difference | P value for difference in BRIb | Overall P value for trendc |
|---|---|---|---|---|
| Mean (SE) [95% CI] | ||||
| 1999-2000 | 4.80 (0.09) [4.62-4.97] | 0 [Reference] | NA | <.001 |
| 2001-2002 | 4.74 (0.05) [4.64-4.85] | −0.05 | .54 | |
| 2003-2004 | 4.98 (0.07) [4.84-5.13] | 0.19 | .17 | |
| 2005-2006 | 5.01 (0.09) [4.83-5.20] | 0.22 | .16 | |
| 2007-2008 | 5.11 (0.07) [4.98-5.24] | 0.32 | .01 | |
| 2009-2010 | 5.12 (0.06) [5.00-5.25] | 0.33 | .01 | |
| 2011-2012 | 5.25 (0.09) [5.08-5.42] | 0.45 | .002 | |
| 2013-2014 | 5.39 (0.07) [5.25-5.54] | 0.60 | <.001 | |
| 2015-2016 | 5.52 (0.11) [5.29-5.74] | 0.72 | <.001 | |
| 2017-2018 | 5.62 (0.12) [5.37-5.86] | 0.82 | <.001 |
Abbreviations: BRI, body roundness index; NA, not applicable.
a
Nationally representative estimates of the nonpregnant US population aged 20 years or more. Estimates were nationally representative through the use of survey weights.
b
P value for difference in mean BRI was calculated using the linear combinations of parameters.
c
P value for overall trend was calculated using the Mann-Kendall trend test.