The Horne and Ostberg Morningness/Eveningness Questionnaire (MEQ) is widely used to differentiate between morning and evening types, but there is very little epidemiological evidence about the distribution of MEQ chronotypes in the general population. The purpose of the present study was to simultaneously investigate the influence of demographic, socioeconomic, and work factors on the distribution of morningness/eveningness. A New Zealand version of the MEQ was mailed to 5000 New Zealand adults, ages 30 to 49 years, who were randomly selected from the electoral rolls (55.7% response rate). A total of 2526 questionnaires were included in the analyses. According to the Horne and Ostberg classification, 49.8% of the total population was classified as morning type compared to 5.6% having an evening-type preference. However, using new cutoffs for middle-aged working adults described by Taillard et al. (2004), 24.7% of the population was morning type and 26.4% was evening type. After controlling for ethnicity, gender, and socioeconomic deprivation, participants ages 30 to 34 years were more likely to be definitely evening type (odds ratio [OR] = 1.59, p < 0.05) and less likely to be morning type (moderately morning type, OR = 0.59, p < 0.01, or definitely morning type, OR = 0.59, p < 0.05) compared to those ages 45 to 49 years. Work schedules were also important predictors of chronotype, with night workers more likely to be definitely evening type (OR = 1.49, p = 0.05) and the unemployed less likely to be moderately morning type (OR = 0.64, p < 0.05) compared to other workers. Evening types were 2.5 times more likely to report that their general health was only poor or fair compared to morning types (p < 0.01). This study confirms that the original criteria of Horne and Ostberg (1976) are not useful for classifying chronotypes in a middle-aged population. The authors conclude that morningness/eveningness preference is largely independent of ethnicity, gender, and socioeconomic position, indicating that it is a stable characteristic that may be better explained by endogenous factors.
Adan A and Almirall H (1991) Horne & Ostberg Morningness-Eveningness Questionnaire: A reduced scale. Person Individ Diff12:241-253.
2.
Int J Psychophysiol12:95-99.
3.
Adan A and Natale V (2002) Gender differences in morningness-eveningness preference. Chronobiol Int19:709-720.
4.
Ancoli-Israel S, Schnierow B, Kelsoe J, and Fink R (2001) A pedigree of one family with delayed sleep phase syndrome. Chronobiol Int18:831-840.
5.
Archer SN, Robilliard DL, Skene DJ, Smits M, Williams A, Arendt J, and von Schantz M (2003) A length polymorphism in the circadian clock gene Per3 is linked to delayed sleep phase syndrome and extreme diurnal preference [see comment]. Sleep26:413-415.
6.
Bliwise DL (2005) Normal aging. In Principles and Practice of Sleep Medicine, Kryger MH, Roth T, and Dement WC, eds, pp 24-28, Philadelphia, Elsevier Saunders.
7.
Borbely AA and Achermann p (1999) Sleep homeostasis and models of sleep regulation [see comment]. J Biol Rhythms14:557-568.
8.
Carrier J, Monk TH, Buysse DJ, and Kupfer DJ (1997) Sleep and morningness-eveningness in the ‘middle’ years of life (20-59 y). J Sleep Res6:230-237.
9.
Carrier J, Monk TH, Buysse DJ, and Kupfer DJ (1998) Morningness-eveningness as a mediator of sleep changes during the young adult and middle years of life (20-59y). Sleep21:299.
10.
Chelminski I, Ferraro R, Petros TV, and Plaud JJ (1997) Horne and Ostberg questionnaire: A score distribution in a large sample of young adults. Person Individ Diff23:647-652.
11.
Chelminski I, Petros TV, Plaud JJ, and Ferraro R (2000) Psychometric properties of the reduced Horne and Ostberg questionnaire. Person Individ Diff29:469-478.
12.
Council of the European Union (1993) Council Directive 93/104/EC of 23 November 1993 concerning certain aspects of the organization of working time. Off J Eur CommL307:18.
13.
Czeisler CA, Buxton OM, and Khalsa SBS (2005) The human circadian timing system and sleep-wake regulation. In Principles and Practices of Sleep Medicine, Kryger MH, Roth T, and Dement WC, eds, pp 375-394, Philadelphia, Elsevier Saunders.
14.
Daan S, Beersma DG, and Borbely AA (1984) Timing of human sleep: Recovery process gated by a circadian pacemaker. Am J Physiol246:R161-R183.
15.
Dahl RE and Carskadon MA (1995) Sleep and its disorders in adolescence. In Principles and Practices of Sleep Medicine in the Child, Ferber R and Kryger MH, eds, pp 19-28, Philadelphia, W. B. Saunders.
16.
Dijk DJ and Czeisler CA (1994) Paradoxical timing of the circadian rhythm of sleep propensity serves to consolidate sleep and wakefulness in humans. Neurosci Lett166:63-68.
17.
Dijk DJ and Edgar E (1999) Circadian and homeostatic control of wakefulness and sleep. In Regulation of Sleep and Circadian Rhythms, Turek FW and Zee PC, eds, pp 111-147, New York, Marcel Dekker.
18.
Electoral Enrolment Centre (2003) Comparison of eligible voting population to enrolled electors by parliamentary electorate from ER87M.
19.
Gale C and Martyn C (1998) Larks and owls and health, wealth, and wisdom. Br Med J317:1675-1677.
20.
Gander PH, Marshall NS, Harris R, and Reid P (2005) The Epworth Sleepiness Scale: Influence of age, ethnicity and socioeconomic deprivation. Sleep28:249-253.
21.
Gander PH, Nguyen D, Rosekind MR, and Connell LJ (1993) Age, circadian rhythms, and sleep loss in flight crews. Aviat Space Environ Med64:189-195.
22.
Harris R (2003) Obstructive sleep apnoea syndrome: Symptoms and risk factors among Maori and non-Maori adults in Aotearoa. Masters of Public Health, Department of Public Health, University of Otago, Wellington.
23.
Horne JA and Ostberg O (1976) A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms. Int J Chronobiol4:97-110.
24.
International Labour Organization (1990) R178 Night Work Recommendation.
25.
Ishihara K, Miyake S, Miyasita A, and Miyata Y (1988) Comparisons of sleep-wake habits of morning and evening types in Japanese worker sample. J Hum Ergol (Tokyo)17:111-118.
26.
Johns M (1991) A new method for measuring daytime sleepiness: The Epworth Sleepiness Scale. Sleep14: 540-545.
27.
Johns M (1992) Reliability and factor analysis of the Epworth Sleepiness Scale. Sleep15:376-381.
28.
Jones CR, Campbell SS, Zone SE, Cooper F, DeSano A, Murphy PJ, Jones B, Czajkowski L, and Ptacek LJ (1999) Familial advanced sleep-phase syndrome: A short-period circadian rhythm variant in humans [see comment]. Nat Med5:1062-1065.
29.
Kerkhof G (1985) Individual differences in circadian rhythms. In Hours of Work: Temporal Factors in Work-Scheduling, Folkard S and Monk T, eds, pp 29-35, New York, John Wiley.
30.
Mecacci L and Zani A (1983) Morningness-eveningness preferences and sleep-waking dairy data of morning and evening types in student and worker samples. Ergonomics26:1147-1153.
31.
Ministry of Health (1999) Taking the Pulse: The 1996/97 New Zealand Health Survey. Wellington, New Zealand: Ministry of Health.
32.
Ministry of Health (2004) A Portrait of Health: Key Results of the 2002/3 New Zealand Health Survey. Wellington, New Zealand: Ministry of Health.
33.
Monk T (2005) Shift work: Basic principles. In Principles and Practice of Sleep Medicine, Kryger MH, Roth T, and Dement WC, eds, pp 673-680, Philadelphia, Elsevier Saunders.
34.
Nunnally JC and Bernstein IH (1994) Psychometric Theory. New York: McGraw-Hill.
35.
Paine S-J, Gander PH, Harris R, and Reid P (2004) Who reports insomnia? Relationships with age, sex, ethnicity and socioeconomic deprivation. Sleep27:1163-1169.
36.
Pollmacher T, Schuld A, Kraus T, Haack M, Hinze-Selch D, and Mullington J (2000) Experimental immunomodulation, sleep, and sleepiness in humans. Ann N Y Acad Sci917:488-499.
Robilliard DL, Archer SN, Arendt J, Lockley SW, Hack LM, English J, Leger D, Smits MG, Williams A, Skene DJ, et al. (2002) The 3111 Clock gene polymorphism is not associated with sleep and circadian rhythmicity in phenotypically characterized human subjects. J Sleep Res11:305-312.
39.
Robson B (2002) Mana whakama-rama—Equal Explanatory Power: Ma-ori and Non-Ma-ori Sample Size in National Health Surveys. Wellington, New Zealand: Eru Po-mare Ma-ori Health Research Centre, Wellington School of Medicine and Health Sciences, University of Otago and Public Health Intelligence, Ministry of Health.
40.
Salmond C and Crampton P (2002) NZDep2001 Index of Deprivation. Wellington, New Zealand: Department of Public Health, Wellington School of Medicine and Health Sciences, University of Otago.
41.
Satoh K, Mishima K, Inoue Y, Ebisawa T, and Shimizu T (2003) Two pedigrees of familial advanced sleep phase syndrome in Japan. Sleep26:416-417.
42.
Smith CS, Reilly C, and Midkiff K (1989) Evaluation of three circadian rhythm questionnaires with suggestions for an improved measure of morningness. J Appl Psychol74:728-738.
43.
Spiegal K, Sheridan JF, and Van Cauter E (2002) Effect of sleep deprivation on response to immunization. JAMA288:1471-1472.
44.
Statistics New Zealand (2002) New Zealand Census of Population and Dwellings 2001. Wellington: Statistics New Zealand.
45.
Taillard J, Philip P, and Bioulac B (1999) Morningness/eveningness and the need for sleep. J Sleep Res8:291-295.
46.
Taillard J, Philip P, Chastang JF, and Bioulac B (2004) Validation of Horne and Ostberg Morningness-Eveningness Questionnaire in a middle-aged population of French workers. J Biol Rhythms19:76-86.
47.
Taillard J, Philip P, Chastang JF, Diefenbach K, and Bioulac B (2001) Is self-reported morbidity related to the circadian clock?J Biol Rhythms16:183-190.
48.
Tankova I, Adan A, and Buela-Casal G (1994) Circadian typology and individual differences: A review. Person Individ Diff16:674-684.
49.
Te Ro-pu-Rangahau Hauora a Eru Po-mare (2000) Counting for nothing: Understanding the issues in monitoring disparities in health. Soc Pol J NZ14:1-16.
50.
Toh KL, Jones CR, He Y, Eide EJ, Hinz WA, Virshup DM, Ptacek LJ, and Fu YH (2001) An hPer2 phosphorylation site mutation in familial advanced sleep phase syndrome. Science291:1040-1043.
51.
Turek FW (2000) Introduction to chronobiology: Sleep and the circadian clock. In Principles and Practices of Sleep Medicine, Kryger MH, Roth T, and Dement WC, eds, pp 319-320, Philadelphia, W. B. Saunders.
52.
Van Cauter E and Spiegal K (1999) Sleep as a mediator of the relationship between socioeconomic status and health: A hypothesis. Ann N Y Acad Sci896:254-261.
53.
Van Dongen HPA (1998) Inter- and Intra-Individual Differences in Circadian Phase. Doctoral dissertation, Department of Physiology, Leiden University, Leiden.
54.
Zlomanczuk P and Schwartz WJ (1999) Cellular and molecular mechanisms of circadian rhythms in mammals. In Regulation of Sleep and Circadian Rhythms, Turek FW and Zee PC, eds, pp 309-342, New York, Marcel Dekker.
