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Table 2 Children born between 2007-2008, maternal demographic data, birth characteristics and medical care

From: Maternal advanced age, single parenthood, and ART increase the risk of child morbidity up to five years of age

  Total Maternal age
  n =23 772 ≤39 years
n = 15 569
≥40 years
n = 8203
 
  n (%) n (%) n (%) p-value
Maternal age     NA
 ≤39 years 15 569 (65.5) - -  
 ≥40 years 8203 (34.5) - -  
Civil status     <.001
 Married/cohabiting 20 767 (87.4) 13 877 (89.1) 6890 (84.0)  
 Single status at registration 3005 (12.6) 1692 (10.9) 1313 (16.0)  
Maternal educational level     <.001
 Elementary 2611 (11.2) 1948 (12.7) 663 (8.3)  
 High school 6245 (40.7) 6245 (40.7) 2951 (36.8)  
 College/University 7156 (46.6) 7156 (46.6) 4400 (54.9)  
Nicotine use during pregnancy     <.001
 No 20 289 (90.0) 13 268 (89.5) 7021 (91.2)  
 Yes 2242 (10.0) 1564 (10.5) 678 (8.8)  
Gender     .772
 Boy 12 361 (52.0) 8085 (51.9) 4276 (52.1)  
 Girl 11 411 (48.0) 7484 (48.1) 3927 (47.9)  
Assisted reproductive technologya     <.001
 No 22 577 (95.0) 15 095 (97.0) 7482 (91.2)  
 Yes 1195 (5.0) 474 (3.0) 721 (8.8)  
Gestational age     .020
 Born at term 22 185 (93.4) 14 573 (93.7) 7612 (92.9)  
 Born pretermb 1570 (6.6) 986 (6.3) 584 (7.1)  
Birthweight     .013
 Normal birthweight 22 611 (95.3) 14 846 (95.5) 7765 (94.8)  
 Low birthweightc 1122 (4.7) 696 (4.5) 426 (5.2)  
Size for gestational age     <.001
 Average for gestational age 22 273 (93.7) 15 288 (98.2) 7978 (97.3)  
 Small for gestational age 506 (2.1) 281 (1.8) 225 (2.7)  
Hospitalizations     
 Outpatient (median/IQR) 2.00/5.00 2.00/5.00 2.00/5.00 .114
 Inpatient (median/IQR) 0.00/1.00 0.00/1.00 0.00/1.00 .007
 Total (median/IQR) 3.00/6.00 3.00/6.00 3.00/5.00 .041
Outpatient visits     .743
 0-10 21 046 (88.6) 13 776 (88.5) 7270 (88.6)  
 11- 2726 (11.5) 1793 (11.5) 933 (11.4)  
Inpatient visits     .203
 0-1 20 893 (87.9) 13 653 (87.7) 7240 (88.6)  
 2- 2879 (12.1) 1916 (12.3) 963 (11.7)  
  1. a Assisted reproductive technology (ART): ovulation induction, in vitro fertilization (IVF) or intra-plasmic sperm injection (ICSI) with own or donated gametes
  2. b Born preterm (PT): born at <37 weeks’ gestation
  3. c Low birth weight (LBW): birth weight <2500 g