Table 1 Characteristics of the study population in Shenzhen from 2008 to 2014
Characteristics | Total | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 |
|---|---|---|---|---|---|---|---|---|
Gender (n, %) | ||||||||
 Male | 38,070 (59.49) | 3777 (57.66) | 4259 (58.06) | 4716 (59.79) | 5032 (59.08) | 5932 (59.42) | 6656 (60.28) | 7698 (60.71) |
 Female | 25,927 (40.51) | 2774 (42.34) | 3077 (41.94) | 3172 (40.21) | 3485 (40.92) | 4051 (40.58) | 4386 (39.72) | 4982 (39.29) |
 Age, mean years a | 63.41 ± 14.04 | 63.74 ± 14.42 | 63.87 ± 14.34 | 63.35 ± 14.13 | 63.11 ± 13.92 | 63.31 ± 13.84 | 63.35 ± 13.90 | 63.38 ± 14.00 |
Age group (n, %) | ||||||||
 18~ | 6305 (9.85) | 706 (10.78) | 778 (10.61) | 816 (10.34) | 836 (9.82) | 949 (9.51) | 1046 (9.47) | 1174 (9.26) |
 45~ | 26,692 (41.71) | 2492 (38.04) | 2766 (37.70) | 3252 (41.23) | 3661 (42.98) | 4296 (43.03) | 4727 (42.81) | 5498 (43.36) |
  ≥ 65 | 31,000 (48.44) | 3353 (51.18) | 3792 (51.69) | 3820 (48.43) | 4020 (47.20) | 4738 (47.46) | 5269 (47.72) | 6008 (47.38) |
Nation | ||||||||
 Han | 63,776 (99.68) | 6550 (100.00) | 7336 (100.00) | 7888 (100.00) | 8517 (100.00) | 9953 (99.70) | 10,980 (99.51) | 12,552 (99.07) |
 Minority | 202 (0.32) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 30 (0.30) | 54 (0.49) | 118 (0.93) |
 Missing | 19 | 1 | 0 | 0 | 0 | 0 | 8 | 10 |
District | ||||||||
 Baoan District | 15,345 (24.01) | 1818 (27.75) | 1923 (26.21) | 2342 (29.69) | 2314 (27.17) | 2683 (26.88) | 2214 (20.1) | 2051 (16.24) |
 Longgang District | 13,917 (21.77) | 1392 (21.25) | 1554 (21.18) | 1608 (20.39) | 1860 (21.84) | 2223 (22.27) | 2522 (22.9) | 2758 (21.83) |
 Futian District | 9051 (14.16) | 1019 (15.55) | 1079 (14.71) | 1070 (13.56) | 1206 (14.16) | 1384 (13.86) | 1521 (13.81) | 1772 (14.03) |
 Luohu District | 8306 (12.99) | 906 (13.83) | 930 (12.68) | 988 (12.53) | 987 (11.59) | 1325 (13.27) | 1510 (13.71) | 1660 (13.14) |
 Nanshan District | 7069 (11.06) | 754 (11.51) | 961 (13.1) | 867 (10.99) | 944 (11.08) | 1163 (11.65) | 1125 (10.21) | 1255 (9.93) |
 Guangming New District | 2273 (3.56) | 54 (0.82) | 185 (2.52) | 333 (4.22) | 358 (4.2) | 385 (3.86) | 405 (3.68) | 553 (4.38) |
 Longhua New District | 2324 (3.64) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 761 (6.91) | 1563 (12.37) |
 Pingshan New District | 1691 (2.65) | 129 (1.97) | 142 (1.94) | 224 (2.84) | 254 (2.98) | 262 (2.62) | 331 (3.00) | 349 (2.76) |
 Yantian District | 1039 (1.63) | 70 (1.07) | 95 (1.29) | 143 (1.81) | 147 (1.73) | 161 (1.61) | 203 (1.84) | 220 (1.74) |
 Dapeng New District | 154 (0.24) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 0 (0.00) | 46 (0.42) | 108 (0.85) |
 Other | 2754 (4.31) | 409 (6.24) | 467 (6.37) | 313 (3.97) | 447 (5.25) | 397 (3.98) | 377 (3.42) | 344 (2.72) |
 Missing | 74 | 0 | 0 | 0 | 0 | 0 | 27 | 47 |
Education | ||||||||
 Primary school | 17,065 (26.67) | 1796 (27.42) | 2024 (27.59) | 2222 (28.17) | 2391 (28.07) | 2630 (26.34) | 2825 (25.59) | 3177 (25.06) |
 Middle school | 25,925 (40.51) | 2601 (39.71) | 3019 (41.15) | 3346 (42.42) | 3399 (39.91) | 3952 (39.59) | 4178 (37.84) | 5430 (42.83) |
 High school | 11,672 (18.24) | 727 (11.1) | 1022 (13.93) | 1164 (14.76) | 1655 (19.43) | 1996 (19.99) | 2637 (23.88) | 2471 (19.49) |
 Bachelor degree or above | 4846 (7.57) | 623 (9.51) | 561 (7.65) | 560 (7.1) | 584 (6.86) | 717 (7.18) | 874 (7.92) | 927 (7.31) |
 Illiteracy | 4486 (7.01) | 803 (12.26) | 710 (9.68) | 596 (7.56) | 488 (5.73) | 688 (6.89) | 527 (4.77) | 674 (5.32) |
 Missing | 3 | 1 | 0 | 0 | 0 | 0 | 1 | 1 |