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Table 1 Mobile phone variables at baseline

From: Mobile phone use and stress, sleep disturbances, and symptoms of depression among young adults - a prospective cohort study

Category Mobile phone variables Men Women
   n = 1455 n = 2701
   Freq % Freq %
  Frequency of calls     
Low 0 per day 69 5 51 2
Low 1-5 per day 952 65 1946 72
Med 6-10 per day 301 21 543 20
High 11-20 per day 97 7 108 4
High More than 20 per day 36 2 47 2
  Frequency of SMS messages     
Low 0 per day 126 9 58 2
Low 1-5 per day 906 62 1609 60
Med 6-10 per day 262 18 634 23
High 11-20 per day 98 7 259 10
High More than 20 per day 60 4 140 5
  Mobile phone use     
Low Low Calls + Low SMS 804 55 1433 53
Med Low Calls + Med SMS or vice versa 326 22 616 23
High High Calls and/or High SMS, or Med Calls + Med SMS 323 22 645 24
  Awakened at night     
Low Never 600 41 989 37
Med Only occasionally 657 45 1248 46
High A few times per month 164 11 386 14
High A few times per week 27 2 68 3
High Almost every day 6 0 9 0
  Availability demands     
Low Never 23 2 12 0
Low Now and then, but not daily 82 6 86 3
Low Daily, but not all day 278 19 828 31
Med All day 680 47 1127 42
High Around the clock 388 27 642 24
  Accessibility stress     
Low Not at all stressful 892 61 1229 46
Med A little bit stressful 418 29 1083 40
High Rather stressful 115 8 311 12
High Very stressful 28 2 75 3
  Overuse     
  Item 1: Use too much 184 13 587 22
  Item 2: Tried to cut down unsuccessfully 87 6 371 14
Low No item 1199 84 1898 71
Med One item 183 13 579 22
High Both items 41 3 187 7
  1. Frequencies (Freq) and percentages (%) in mobile phone variables for the men and women, including categorizations into Low, Medium (Med), and High. Questionnaire items are presented in footnote1. Missing values (non-responses to items) are not accounted for, which means that the n varies for the variables.
  2. 1Questionnaire items; Frequency of calls: How many mobile phone calls on average have you made and received per day (the past 30 days)?, Frequency of SMS messages: How many SMS messages on average have you sent and received per day (the past 30 days)?, Awakened at night: How often have you been awakened by the mobile phone at night (the past 30 days)?, Availability demands: To what extent are you expected by those around you to be accessible via the mobile phone?, Accessibility stress: To what extent do you perceive accessibility via mobile phones as stressful?, Overuse: 1. Do you or someone close to you think that you use the mobile phone too much?, 2. Have you tried, but failed, to cut down on your use of the mobile phone?