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Table 1 Demographic characteristics of the adolescents in East China (n = 6902)

From: How do socioeconomic status relate to social relationships among adolescents: a school-based study in East China

Characteristics Junior high school (n = 4208) Senior high school (n = 2694) X2 p
Gender
 Boys 2029 (48.2) 1326 (49.2) 0.661 0.416
 Girls 2179 (51.8) 1368 (50.8)
Household registration
 Urban 1886 (44.8) 992 (36.8) 43.205 < 0.001
 Rural 2322 (55.2) 1702 (63.2)
Family structure
 Intact family 3516 (83.6) 2315 (85.9) 7.076 0.008
 Non-intact family 692 (16.4) 379 (14.1)
Family size
 Non-only child 1997 (47.5) 1535 (57.0) 59.592 < 0.001
 Only child 2211 (52.5) 1159 (43.0)
Subjective SES
 Lower class 605 (14.4) 517 (19.2) 81.416 < 0.001
 Middle class 2899 (68.9) 1914 (71.0)
 Upper class 704 (16.7) 263 (9.8)
Paternal education
 Low 67 (1.5) 75 (2.8) 17.935 < 0.001
 Medium 2607 (62.0) 1728 (64.1)
 High 1534 (36.5) 891 (33.1)
Maternal education
 Low 243 (5.7) 205 (7.6) 18.848 < 0.001
 Medium 2742 (65.2) 1812 (67.3)
 High 1223 (29.1) 677 (25.1)
Paternal occupation
 Low 68 (1.6) 46 (1.7) 3.986 0.136
 Medium 2299 (54.6) 1535 (57.0)
 High 1841 (43.8) 1113 (41.3)
Maternal occupation
 Low 612 (14.5) 359 (13.3) 20.774 < 0.001
 Medium 2061 (49.0) 1470 (54.6)
 High 1535 (36.5) 865 (32.1)