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Table 1 Descriptive data for the analysis variables

From: Social class and gender patterning of insomnia symptoms and psychiatric distress: a 20-year prospective cohort study

Sample characteristics (n = 999) N (%)
Gender Male 457 (45.7)
  Female 542 (54.3)
Social class at age 36 Non-manual 686 (68.7)
  Manual 304 (30.4)
  Missing 9 (0.9)
GHQ (2+) at age 36 No 593 (59.4)
  Yes 303 (30.3)
  Missing 103 (10.3)
GHQ (2+) at age 57 No 706 (70.7)
  Yes 255 (25.5)
  Missing 38 (3.8)
Most likely sleep class Healthy 464 (46.4)
  Episodic maintenance 164 (16.4)
  Developing 250 (25.0)
  Chronic Mixed 112 (11.2)
  Missing 9 (0.9)