Table 1 The prevalence of demographic characteristics among chronotype
From: Role of polygenic risk scores in the association between chronotype and health risk behaviors
Variables | Total N(%) | Eveningness n(%) | Intermediate n(%) | Morningness n(%) | χ2 /F value |
|---|---|---|---|---|---|
Age | 264 | 14.85 ± 1.52 | 14.21 ± 2.01 | 13.91 ± 1.70 | 3.01* |
Gender | Â | Â | Â | Â | 6.92* |
 Male | 157(62.1) | 14(8.9) | 91(58.0) | 52(33.1) |  |
 Female | 103(37.9) | 20(19.4) | 58(56.3) | 25(24.3) |  |
Residential areas | Â | Â | Â | Â | 2.48 |
 Country | 16(6.1) | 2(12.5) | 7(43.8) | 7(43.8) |  |
 Town | 42(15.8) | 5(11.9) | 27(64.3) | 10(23.8) |  |
 Urban | 204(78.1) | 27(13.2) | 117(57.4) | 60(29.4) |  |
Only child | Â | Â | Â | Â | 0.16 |
 Yes | 69(26.1) | 9(13.0) | 41(59.4) | 19(27.5) |  |
 No | 193(73.9) | 25(13.0) | 110(57.0) | 58(30.1) |  |
Father’s education |  |  |  |  | 2.77 |
 Junior high and below | 95(36.0) | 8(8.4) | 58(61.1) | 29(30.5) |  |
 High school or technical secondary school | 95(36.4) | 15(15.8) | 53(55.8) | 27(28.4) |  |
 Junior college or above | 72(27.7) | 11(15.3) | 40(55.6) | 21(29.2) |  |
Mother’s education |  |  |  |  | 5.62 |
 Junior high and below | 117(44.7) | 13(11.1) | 76(65.0) | 28(23.9) |  |
 High school or technical secondary school | 87(32.6) | 12(13.8) | 43(49.4) | 32(36.8) |  |
 Junior college or above | 58(22.7) | 9(15.5) | 32(55.2) | 17(29.3) |  |
Family economic conditions | Â | Â | Â | Â | 9.24 |
 Very bad | 5(1.9) | 2(40.0) | 2(40.0) | 1(20.0) |  |
 Worse | 19(7.2) |  2(10.5) | 10(52.6) | 7(36.8) |  |
 Medium | 180(68.6) | 22(12.2) | 112(62.2) | 46(25.6) |  |
 Better | 43(16.7) | 6(14.0) | 21(48.8) | 16(37.2) |  |
 Very good | 15(5.7) | 2(13.3) | 6(40.0) | 7(46.7) |  |
Friends number | Â | Â | Â | Â | 3.66 |
 No | 9(3.4) | 0(0.0) | 5(55.6) | 4(44.4) |  |
 1–2 | 49(18.6) | 6(12.2) | 27(55.1) | 16(32.7) |  |
 3–5 | 85(32.6) | 9(10.6) | 51(60.0) | 25(29.4) |  |
 6 or more | 119(45.5) | 19(16.0) | 68(57.1) | 32(26.9) |  |
Learning burden | Â | Â | Â | Â | 5.72 |
 Light | 18(6.8) | 0(0.0) | 10(55.6) | 8(44.4) |  |
 Medium | 155(59.5) | 22(14.2) | 85(54.8) | 48(31.0) |  |
 Heavy | 89(33.6) | 12(13.5) | 56(62.9) | 21(23.6) |  |