Table 1 Characteristics of trial participants across study arms
SAS sodium intervention | Attention placebo control (APC) | Do-nothing exposed control | Do-nothing unexposed control | p value (ANOVA or chi-square) | |
|---|---|---|---|---|---|
N | 2083 | 2102 | 2267 | 2160 | |
Age, mean (SD) | 40.4 (13.3) | 40.7 (13.5) | 40.5 (13.3) | 40.6 (13.4) | 0.88 |
Sex | 0.41 | ||||
Female | 1249 (60.0%) | 1237 (58.8%) | 1283 (56.6%) | 1280 (59.3%) | |
Male | 821 (39.4%) | 854 (40.6%) | 969 (42.7%) | 867 (40.1%) | |
Missing | 13 (0.6%) | 11 (0.5%) | 15 (0.7%) | 13 (0.6%) | |
Highest education level completed | 0.96 | ||||
High school/GED or less | 395 (19.0%) | 378 (18.0%) | 426 (18.8%) | 400 (18.5%) | |
Technical/community college | 287 (13.8%) | 303 (14.4%) | 332 (14.6%) | 307 (14.2%) | |
Undergraduate degree | 739 (35.5%) | 740 (35.2%) | 832 (36.7%) | 782 (36.2%) | |
Graduate degree or higher | 391 (18.8%) | 401 (19.1%) | 404 (17.8%) | 405 (18.8%) | |
Missing | 271 (13.0%) | 280 (13.3%) | 273 (12.0%) | 266 (12.3%) | |
Ethnicity | 0.96 | ||||
White | 1315 (63.1%) | 1334 (63.5%) | 1409 (62.2%) | 1365 (63.2%) | |
Black | 278 (13.3%) | 293 (13.9%) | 337 (14.9%) | 309 (14.3%) | |
Asian | 230 (11.0%) | 204 (9.7%) | 230 (10.1%) | 225 (10.4%) | |
Mixed | 156 (7.5%) | 148 (7.0%) | 171 (7.5%) | 148 (6.9%) | |
Other | 85 (4.1%) | 99 (4.7%) | 99 (4.4%) | 91 (4.2%) | |
Missing | 19 (0.9%) | 24 (1.1%) | 21 (0.9%) | 22 (1.0%) | |
Country of birth | 0.77 | ||||
Within the US | 1838 (88.2%) | 1856 (88.3%) | 2006 (88.5%) | 1900 (88.0%) | |
Outside of the US | 225 (10.8%) | 229 (10.9%) | 246 (10.9%) | 248 (11.5%) | |
Missing | 20 (1.0%) | 17 (0.8%) | 15 (0.7%) | 12 (0.6%) | |
Language | 0.38 | ||||
English | 1922 (92.3%) | 1964 (93.4%) | 2091 (92.2%) | 1989 (92.1%) | |
Other language | 136 (6.5%) | 125 (5.9%) | 149 (6.6%) | 148 (6.9%) | |
Missing | 25 (1.2%) | 13 (0.6%) | 27 (1.2%) | 23 (1.1%) | |
Household income | 0.85 | ||||
<$20,000 | 167 (8.0%) | 188 (8.9%) | 208 (9.2%) | 191 (8.8%) | |
$20,000–$49,999 | 379 (18.2%) | 397 (18.9%) | 437 (19.3%) | 414 (19.2%) | |
$50,000–$99,999 | 600 (28.8%) | 632 (30.1%) | 657 (29.0%) | 630 (29.2%) | |
$100,000–$149,999 | 304 (14.6%) | 302 (14.4%) | 309 (13.6%) | 298 (13.8%) | |
$150,000+ | 185 (8.9%) | 171 (8.1%) | 200 (8.8%) | 207 (9.6%) | |
Missing | 448 (21.5%) | 412 (19.6%) | 456 (20.1%) | 420 (19.4%) | |
Political affiliation | 0.43 | ||||
Democrat | 718 (34.5%) | 758 (36.1%) | 771 (34.0%) | 788 (36.5%) | |
Republican | 305 (14.6%) | 303 (14.4%) | 354 (15.6%) | 317 (14.7%) | |
Independent/None/Other | 586 (28.1%) | 568 (27.0%) | 649 (28.6%) | 555 (25.7%) | |
Missing | 474 (22.8%) | 473 (22.5%) | 493 (21.7%) | 500 (23.1%) | |
Student status | 0.93 | ||||
No | 1447 (69.5%) | 1467 (69.8%) | 1589 (70.1%) | 1515 (70.1%) | |
Yes | 286 (13.7%) | 286 (13.6%) | 324 (14.3%) | 303 (14.0%) | |
Missing | 350 (16.8%) | 349 (16.6%) | 354 (15.6%) | 342 (15.8%) | |
Long term health condition or disability | 0.20 | ||||
No | 1245 (59.8%) | 1269 (60.4%) | 1366 (60.3%) | 1301 (60.2%) | |
Yes | 561 (26.9%) | 602 (28.6%) | 653 (28.8%) | 614 (28.4%) | |
Missing | 277 (13.3%) | 231 (11.0%) | 248 (10.9%) | 245 (11.3%) |
