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Table 2 Infant characteristics and their differences between the normal and excessive use groups

From: Association of excessive mobile phone use during pregnancy with birth weight: an adjunct study in Kumamoto of Japan Environment and Children’s Study

Infant characteristics Total (N = 461) Mobile ordinary user (N = 415) Mobile excessive user (N = 46) P value
Gender
 Boy 247 (53.6%) 227 (54.7%) 20 (43.5%) 0.15
 Girl 214 (46.4%) 188 (45.3%) 26 (56.5%)  
Mode of delivery
 Transvaginal 386 (83.7%) 346 (83.4%) 40 (87.0%) 0.53
 Caesarean section 75 (16.3%) 69 (16.6%) 6 (13.0%)  
Gestational age 39.39 (±1.18) 39.41 (±1.18) 39.21 (±1.18) 0.27
Birth weight (g) 3154.25 (±389.34) 3167.16 (±394.05) 3037.74 (±324.87) 0.03
Birth height (cm) 48.94 (±1.70) 48.93 (±1.72) 49.00 (±1.51) 0.792
Birth head circumference (cm) 33.35 (±1.38) 33.39 (±1.37) 32.98 (±1.43) 0.06
Birth chest circumference (cm) 32.40 (±1.67) 32.45 (±1.65) 31.94 (±1.77) 0.05
Placental weight (g) 587.74 (±111.76) 588.71 (±114.11) 579.00 (88.34) 0.50
Low birth weight
 1500–2500 g 16 (3.5%) 15 (3.6%) 1 (2.2%) 0.61
 >2500 g 445 (96.5%) 400 (96.4%) 45 (97.8%)  
Premature birth
 Yes 14 (3.0%) 12 (2.9%) 2 (4.3%) 0.59
 No 447 (97.0%) 403 (91.7%) 44 (95.7%)  
Emergency transport
 Yes 10 (2.2%) 7 (1.7%) 3 (6.5%) 0.03
 No 451 (97.8%) 408 (98.3%) 43 (93.5%)