Table 1 Summary statistics of characteristics and the prevalence of asthma and allergic diseases among different groups

From: Breastfeeding duration modified the effects of neonatal and familial risk factors on childhood asthma and allergy: a population-based study

Variable Total (%) Asthma (%) p-value AR (%) p-value Urticaria (%) p-value FA (%) p-value DA (%) p-value
Prevalence 10,464 1453 (13.9)   2372 (22.7)   1600 (15.3)   851 (8.1)   477 (4.6)  
Sex     < 0.001    < 0.001   0.010   0.091   0.031
 Boys 5464 (52.2) 883 (16.2)   1429 (26.2)   883 (16.2)   468 (8.6)   272 (5.0)  
 Girls 5000 (47.8) 570 (11.4)   943 (18.9)   717 (14.3)   383 (7.7)   205 (4.1)  
Age (year)    0.251   0.447   0.071   0.740   0.166
 6 713 (6.8) 103 (14.4)   145 (20.3)   118 (16.5)   63 (8.8)   31 (4.3)  
 7 2138 (20.4) 290 (13.6)   469 (21.9)   360 (16.8)   184 (8.6)   86 (4.0)  
 8 2092 (20.0) 320 (15.3)   498 (23.8)   323 (15.4)   174 (8.3)   85 (4.1)  
 9 2045 (19.5) 289 (14.1)   459 (22.4)   277 (13.5)   160 (7.8)   90 (4.4)  
 10 1988 (19.0) 253 (12.7)   459 (23.1)   304 (15.3)   148 (7.4)   102 (5.1)  
 11 1488 (14.2) 198 (13.3)   342 (23.0)   218 (14.7)   122 (8.2)   83 (5.6)  
Mode of delivery     < 0.001    < 0.001    < 0.001   0.010   0.094
 Vaginal delivery 4224 (40.4) 523 (12.4)   878 (20.8)   576 (13.6)   308 (7.3)   175 (4.1)  
 Caesarean section 6240 (59.6) 930 (14.9)   1494 (23.9)   1024 (16.4)   543 (8.7)   3002 (4.8)  
Breastfeeding duration (months)     < 0.001    < 0.001   0.008   0.132   0.001
 ≤ 6 m 5373 (51.3) 825 (15.4)   1388 (25.8)   870 (16.2)   458 (8.5)   279 (5.2)  
 > 6 m 5091 (48.7) 628 (12.3)   984 (19.3)   730 (14.3)   393 (7.7)   198 (3.9)  
Birth weight (g)    0.388   0.569   0.593   0.837   0.737
 < 2500 g 298 (3.0) 50 (16.8)   62 (20.8)   52 (17.4)   26 (8.7)   11 (3.7)  
 2500–4000 g 8896 (88.5) 1251 (14.1)   2054 (23.1)   1379 (15.5)   726 (8.2)   414 (4.7)  
 ≥ 4000 g 855 (8.5) 117 (13.7)   190 (22.2)   128 (15.0)   74 (8.7)   40 (4.7)  
Gestational week (weeks)    0.027   0.570   0.406   0.213   0.399
 < 37w 946 (9.1) 158 (16.7)   222 (23.5)   159 (16.8)   91 (9.6)   43 (4.5)  
 37-42w 8972 (86.6) 1219 (13.6)   2039 (22.7)   1370 (15.3)   722 (8.0)   406 (4.5)  
 ≥ 43w 440 (4.2) 65 (14.8)   92 (20.9)   64 (14.5)   33 (7.5)   26 (5.9)  
Only child     < 0.001    < 0.001    < 0.001    < 0.001    < 0.001
 Yes 6524 (62.3) 990 (15.2)   1687 (25.9)   1104 (16.9)   590 (9.0)   347 (5.3)  
 No 3940 (37.3) 463 (11.8)   685 (17.4)   496 (12.6)   261 (6.6)   130 (3.3)  
Family historyof allergy     < 0.001    < 0.001    < 0.001    < 0.001    < 0.001
 Yes 2450 (23.4) 639 (26.1)   1094 (44.7)   636 (26.0)   412 (16.8)   205 (8.4)  
 No 8014 (76.6) 814 (10.2)   1278 (15.9)   964 (12.0)   439 (5.5)   272 (3.4)  
Home ownership     < 0.001    < 0.001    < 0.001    < 0.001    < 0.001
 Have 7743 (74.0) 1179 (15.2)   2015 (26.0)   1345 (17.4)   701 (9.1)   391 (5.0)  
 Not have 2721 (26.0) 274 (10.1)   357 (13.1)   255 (9.4)   150 (5.5)   86 (3.2)  
Residential area    0.013    < 0.001    < 0.001    < 0.001   0.014
 Urban 5324 (50.9) 756 (14.2)   1367 (25.7)   887 (16.7)   481 (9.0)   256 (4.8)  
 Urban–rural juction 4077 (39.0) 584 (14.3)   855 (21.0)   599 (14.7)   316 (7.8)   192 (4.7)  
 Industrial zone 79 (0.8) 10 (12.7)   9 (11.4)   10 (12.7)   6 (7.6)   0 (0.0)  
 Rural 984 (9.4) 103 (10.5)   141 (14.3)   104 (10.6)   48 (4.9)   29 (2.9)  
  1. Data were presented with frequency and percentage; p-value was calculated by Pearson’s chi-squared (χ2) test;