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Table 2 Insomnia Severity Index (ISI)/Epworth Sleepiness Scale (ESS) according to subject characteristics

From: The effect of aircraft noise on sleep disturbance among the residents near a civilian airport: a cross-sectional study

Characteristics   ISI ESS
Normal Sub-threshold insomnia Moderated insomnia Severe insomnia Normal Daytime hypersomnia
Sex Male 726(65.4) 267(24.0) 106(9.5) 12(1.1)c)*** 972(87.5) 139(12.5)a)
Female 1230(56.0) 630(28.7) 276(12.6) 61(2.8) 1881(85.6) 316(14.4)
Mean age(years)b)   48.7 ± 14.3 52.0 ± 13.6 54.6 ± 13.2 57.7 ± 11.9** 49.9 ± 14.2 54.2 ± 13.1**
Age(years)c) 20-29 200(74.6) 56(20.9) 11(4.1) 1(0.4)**** 250(93.3) 18(6.7)****
30-39 389(66.5) 140(23.9) 52(8.9) 4(0.7) 527(90.1) 58(9.9)
40-49 409(62.3) 164(25.0) 70(10.7) 13(2.0) 570(86.9) 86(13.1)
50-59 420(56.8) 218(29.5) 85(11.5) 16(2.2) 631(85.4) 108(14.6)
60-69 394(51.6) 229(30.0) 112(14.7) 29(3.8) 637(83.4) 127(16.6)
70-74 144(48.7) 90(30.4) 52(17.6) 10(3.4) 238(80.4) 58(19.6)
Educationc) Never 41(53.2) 22(28.6) 12(15.6) 2(2.6)**** 63(81.8) 14(18.2)****
Elementary School 174(50.7) 104(30.3) 58(16.9) 7(2.1) 279(81.3) 64(18.7)
Middle school 267(52.1) 150(29.3) 74(14.5) 21(4.1) 434(84.8) 78(15.2)
High school 849(60.3) 365(25.9) 160(11.4) 33(2.4) 1199(85.2) 208(14.8)
College or more 625(64.5) 256(26.4) 78(8.1) 10(1.0) 878(90.6) 91(9.4)
Residency period(year)c) ≥15 446(54.0) 253(30.6) 108(13.1) 19(2.3)**** 685(82.9) 141(17.1)***
10-14 381(58.2) 179(27.3) 76(11.6) 19(2.9) 571(87.2) 84(12.8)
5-9 418(61.6) 165(24.3) 80(11.8) 16(2.4) 592(87.2) 87(12.8)
<5 442(61.7) 195(27.2) 68(9.5) 11(1.5) 625(87.3) 91(12.7)
Drinking No 1164(56.6) 573(27.9) 265(12.9) 53(2.6)c)**** 1776(86.4) 279(13.6)a)
Yes 792(63.2) 324(25.9) 117(9.3) 20(1.6) 1077(86.0) 176(14.0)
Smokingc) Never 1474(57.9) 708(27.8) 300(11.8) 64(2.5)*** 2190(86.0) 356(14.0)
Past smoker 180(65.9) 68(24.9) 24(8.8) 1(0.4) 229(83.9) 44(16.1)
Current smoker 302(61.8) 121(24.7) 58(11.9) 8(1.6) 434(88.8) 55(11.2)
Regular Exercise No 1111(62.0) 454(25.3) 199(11.1) 29(1.6)c)**** 1532(85.4) 261(14.6)a)
Yes 845(55.8) 443(29.2) 183(12.1) 44(2.9) 1321(87.2) 194(12.8)
Operation or hospitalization within 1 year No 1830(60.5) 801(26.5) 329(10.9) 65(2.2)c)**** 2625(86.8) 400(13.2)a)*
Yes 126(44.5) 96(33.9) 53(18.7) 8(2.8) 228(80.6) 55(19.4)
Noise exposure Groupc) Control 376(78.8) 75(15.7) 25(5.2) 1(0.2)**** 451(94.6) 26(5.4)****
Low-exposure 782(55.7) 426(30.4) 155(11.1) 40(2.8) 1214(86.5) 189(13.5)
High-exposure 798(55.9) 396(27.7) 202(14.2) 32(2.2) 1188(83.2) 240(16.8)
  1. a)By Chi-square test
  2. b)By ANOVA
  3. c)By Mantel-Haeszel Chi-square test
  4. *p < 0.05, **p < 0.001, ***p for trend < 0.05, ****p for trend < 0.001