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. 2021 Jan 7;16(1):e0244717. doi: 10.1371/journal.pone.0244717

Table 1. Demographic characteristics of study participants (N = 263).

Variable N %
Ethnicity    
  Hispanic 36 14.0
Race    
  White, European-American, or Caucasian 151 58.3
  Black or African-American 52 20.1
  Asian 34 13.1
  American Indian or Alaskan Native 7 2.7
  Other 15 5.8
Gender Identification    
  Male 56 21.6
  Female 194 74.9
  Other 9 3.5
Household Income    
  <$21,000 per year 48 18.7
  $21,000 - $40,000 per year 44 17.1
  $41,000 - $60,000 per year 48 18.7
  $61,000 - $80,000 per year 33 12.8
  $81,000 - $100,000 per year 31 12.1
  >$100,000 per year 53 20.6
Education    
  Less than high school 1 0.4
  Highschool diploma 20 7.8
  Some college 56 21.7
  Associates/2-year degree 21 8.1
  Bachelors/4-year degree 88 34.1
  Graduate school or above 72 27.9
Marital status    
  Single 81 31.3
  Partnered/In a relationship 47 18.1
  Married 98 37.8
  Separated 2 0.8
  Divorced 27 10.4
  Widowed 4 1.5
Sleep-related conditions    
  Insomnia 64 25.2
  Sleep apnea 40 15.7
  Narcolepsy 5 2.0
  Restless leg syndrome 22 8.7
  Night terrors 12 4.7
  Other 11 4.3