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Table 1 Characteristics of the study population in Shenzhen from 2008 to 2014

From: Association between short-term exposure to air pollution and ischemic stroke onset: a time-stratified case-crossover analysis using a distributed lag nonlinear model in Shenzhen, China

CharacteristicsTotal2008200920102011201220132014
Gender (n, %)
 Male38,070 (59.49)3777 (57.66)4259 (58.06)4716 (59.79)5032 (59.08)5932 (59.42)6656 (60.28)7698 (60.71)
 Female25,927 (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 a63.41 ± 14.0463.74 ± 14.4263.87 ± 14.3463.35 ± 14.1363.11 ± 13.9263.31 ± 13.8463.35 ± 13.9063.38 ± 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)
  ≥ 6531,000 (48.44)3353 (51.18)3792 (51.69)3820 (48.43)4020 (47.20)4738 (47.46)5269 (47.72)6008 (47.38)
Nation
 Han63,776 (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)
 Minority202 (0.32)0 (0.00)0 (0.00)0 (0.00)0 (0.00)30 (0.30)54 (0.49)118 (0.93)
 Missing1910000810
District
 Baoan District15,345 (24.01)1818 (27.75)1923 (26.21)2342 (29.69)2314 (27.17)2683 (26.88)2214 (20.1)2051 (16.24)
 Longgang District13,917 (21.77)1392 (21.25)1554 (21.18)1608 (20.39)1860 (21.84)2223 (22.27)2522 (22.9)2758 (21.83)
 Futian District9051 (14.16)1019 (15.55)1079 (14.71)1070 (13.56)1206 (14.16)1384 (13.86)1521 (13.81)1772 (14.03)
 Luohu District8306 (12.99)906 (13.83)930 (12.68)988 (12.53)987 (11.59)1325 (13.27)1510 (13.71)1660 (13.14)
 Nanshan District7069 (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 District2273 (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 District2324 (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 District1691 (2.65)129 (1.97)142 (1.94)224 (2.84)254 (2.98)262 (2.62)331 (3.00)349 (2.76)
 Yantian District1039 (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 District154 (0.24)0 (0.00)0 (0.00)0 (0.00)0 (0.00)0 (0.00)46 (0.42)108 (0.85)
 Other2754 (4.31)409 (6.24)467 (6.37)313 (3.97)447 (5.25)397 (3.98)377 (3.42)344 (2.72)
 Missing74000002747
Education
 Primary school17,065 (26.67)1796 (27.42)2024 (27.59)2222 (28.17)2391 (28.07)2630 (26.34)2825 (25.59)3177 (25.06)
 Middle school25,925 (40.51)2601 (39.71)3019 (41.15)3346 (42.42)3399 (39.91)3952 (39.59)4178 (37.84)5430 (42.83)
 High school11,672 (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 above4846 (7.57)623 (9.51)561 (7.65)560 (7.1)584 (6.86)717 (7.18)874 (7.92)927 (7.31)
 Illiteracy4486 (7.01)803 (12.26)710 (9.68)596 (7.56)488 (5.73)688 (6.89)527 (4.77)674 (5.32)
 Missing31000011
  1. a: mean ± standard deviation