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. 2017 Mar 1;12(3):e0172510. doi: 10.1371/journal.pone.0172510

Table 1. Sample demographics by year.

2007 n(%) N = 1212 2008 n(%) N = 1243 2009 n(%)N = 1292 2010 n(%) N = 1261 2011 n(%) N = 1265 2012 n(%) N = 2519 2013 n(%) N = 2537 2014 n(%) N = 1223 Total N = 12,552
Gender
Male 607 (50.1) 623 (50.1) 648 (50.2) 635 (50.4) 633 (50.0) 1260 (50.0) 1288 (50.8) 611 (50.0) 6305 (50.2)
Female 605 (49.9) 620 (49.9) 644 (49.8) 626 (49.6) 632 (50.0) 1259 (50.0) 1249 (49.2) 612 (50.0) 6247 (49.8)
Age
18–64 953 (79.1) 969 (78.5) 949 (73.9) 958 (76.6) 924 (73.6) 1744 (69.6) 1740 (69.1) 807 (66.3) 9044 (72.5)
65+ 252 (20.9) 266 (21.5) 336 (26.1) 293 (23.4) 331 (26.4) 760 (30.4) 777 (30.9) 411 (33.7) 3426 (27.5)
Employment
Yes 700 (58.2) 722 (58.2) 713 (55.4) 744 (59.0) 731 (57.9) 1418 (56.5) 1435 (56.7) 675 (55.2) 7138 (57.0)
No 502 (41.8) 519 (41.8) 574 (44.6) 517 (41.0) 532 (42.1) 1093 (43.5) 1098 (43.3) 547 (44.8) 5382 (43.0)
Education
0–12 years 614 (52.1) 642 (52.0) 669 (52.3) 613 (49.0) 592 (47.3) 1159 (46.5) 1126 (44.7) 550 (45.4) 5965 (48.1)
13+ years 565 (47.9) 592 (48.0) 611 (47.7) 637 (51.0) 659 (52.7) 1333 (53.5) 1391 (55.3) 661 (54.6) 6449 (51.9)
Location
City 597 (49.6) 627 (50.6) 635 (49.2) 656 (52.2) 771 (61.1) 1487 (59.2) 1586 (62.7) 730 (59.9) 7089 (56.6)
Town 319 (26.5) 328 (26.5) 349 (27.1) 321 (25.5) 276 (21.9) 617 (24.6) 572 (22.6) 257 (21.1) 3039 (24.3)
Rural 287 (23.9) 285 (23.0) 306 (23.7) 280 (22.3) 215 (17.0) 408 (16.2) 373 (14.7) 232 (19.0) 2386 (19.1)