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Table 1 Characteristics of U.S. Children between birth and 17 years old by birth characteristics, NSCH (2011–2012)

From: Is preterm birth associated with asthma among children from birth to 17 years old? -A study based on 2011-2012 US National Survey of Children’s Health

Variable Total Term born(n = 80,295) Preterm birth(n = 10,426) P value Normal Birth Weight(n = 82,519) Low Birth Weight(n = 8202) P value
  Unweighted n(weight%) Unweighted n(weight%) Unweighted n(weight%) Unweighted n(weight%) Unweighted n(weight%)
Asthma     < 0.001*    < 0.001*
 Yes 12,839 (15%) 10,763 (14%) 2076 (21%)   11,294 (14%) 1545 (19%)  
 No 77,882 (85%) 69,532 (86%) 8350 (79%)   71,225 (86%) 6657 (81%)  
Gender of Child     0.337    < 0.001*
 Male 46,673 (51%) 41,091 (51%) 5582 (52%)   42,763 (52%) 3910 (46%)  
 Female 43,953 (49%) 39,115 (49%) 4838 (48%)   39,671 (48%) 4282 (54%)  
Child’s age at interview (years)     0.0075*    0.0307
 <=3 19,036 (22%) 16,848 (22%) 2188 (23%)   17,379 (22%) 1657 (22%)  
 4~6 14,912 (17%) 13,031 (17%) 1881 (19%)   13,383 (17%) 1529 (20%)  
 7~12 29,915 (33%) 26,351 (33%) 3564 (33%)   27,077 (33%) 2838 (33%)  
 13~17 26,858 (28%) 24,065 (28%) 2793 (58%)   24,680 (28%) 2178 (26%)  
Race/Ethnicity of Child     0.001*    < 0.001*
 Hispanic 11,758 (23%) 10,417 (23%) 1341 (21%)   10,525 (23%) 1233 (24%)  
 Non-Hispanic white 59,186 (54%) 52,727 (54%) 6459 (51%)   54,690 (55%) 4496 (42%)  
 Non-Hispanic black 8231 (13%) 7069 (13%) 1162 (17%)   6977 (12%) 1254 (23%)  
 Non-Hispanic other 9472 (10%) 8271 (10%) 1201 (11%)   8474 (10%) 998 (11%)  
Parents’ Education     0.89    0.0149
 Less than high school 11,903 (20%) 10,459 (20%) 1444 (20%)   10,569 (20%) 1334 (22%)  
 High school graduate 29,176 (32%) 25,784 (32%) 3392 (33%)   26,539 (32%) 2637 (33%)  
 More than high school 44,745 (48%) 39,774 (48%) 4971 (47%)   41,042 (48%) 3703 (45%)  
Family Structure        
 Currently married 64,235 (66%) 57,302 (67%) 6933 (62%) < 0.001* 59,112 (67%) 5123 (58%) < 0.001*
 Cohabiting 5533 (8.8%) 4839 (8.7%) 694 (9.7%)   4909 (8.7%) 624 (10%)  
 Living apart 10,559 (14%) 9153 (13%) 1406 (15%)   9459 (13%) 1100 (16%)  
 Never married 6674 (9.1%) 5764 (8.8%) 910 (11%)   5843 (8.8%) 831 (12%)  
 No parents in household 2678 (2.4%) 2321 (2.4%) 357 (2.7%)   2263 (2.3%) 415 (3.8%)  
Difficulty paying for bills     < 0.001*    
 Never 43,447 (43%) 38,913 (43%) 4534 (39%)   39,832 (43%) 3615 (42%)  
 Not very often 26,836 (32%) 23,745 (32%) 3091 (31%)   24,510 (32%) 2326 (30%)  
 Somewhat often 13,920 (19%) 12,075 (18%) 1845 (21%)   12,415 (19%) 1505 (20%)  
 Very often 4927 (6.9%) 4144 (6.7%) 783 (8.7%)   4334 (6.8%) 593 (8.3%)  
Use of cigarettes, cigars, or pipe tobacco in the household     0.0013*    0.0094*
 Yes 20,950 (24%) 18,254 (24%) 2696 (27%)   18,714 (24%) 2236 (27%)  
 No 68,942 (76%) 61,303 (76%) 7639 (73%)   63,061 (76%) 5881 (73%)  
Litter or garbage on the street or sidewalk     0.7236    0.3326
 Yes 13,341 (16%) 11,772 (16%) 1569 (16%)   12,058 (16%) 1283 (17%)  
 No 76,024 (84%) 67,321 (84%) 8703 (84%)   69,241 (84%) 6783 (83%)  
  1. *p < 0.05