title: Frequency of headache among the employees of a rubber company in the state of São Paulo, Brazil.
abstract: OBJECTIVE
  Primary headaches may be responsible for absenteeism and a fall in the yield and productivity of work. The aim of this study was to establish the presence and frequency of primary headache among employees of a rubber shoe sole company, and its link to absenteeism.
  
  
  METHODS
  Cross-sectional study carried out with help from the staff of the medical and social department of a rubber factory located in the municipality of Franca, São Paulo.
  
  
  METHODS
  A questionnaire on headache characteristics was distributed to all employees. The returned and completed questionnaires were divided into two groups: with and without reports of headache. The headaches were classified into four main groups: migraine, tension-type headache (TTH), cluster headache and others. In terms of the reported frequency, headaches were also classified as chronic daily headache (CDH).
  
  
  RESULTS
  The number of valid questionnaires was 392 (59%); 80.9% were from male and 19.1% from female employees. Headaches were reported by 120 subjects (30.6%), with 17.4% belonging to the migraine group and 8.9% to the TTH group. Migraine was more frequent (p < 0.001) among all participants and also among the women (p < 0.05). TTH was more frequent among the men (p < 0.05). CDH was identified in 14 individuals (3.6%).
  
  
  CONCLUSIONS
  Headache was a common problem among the employees of this company and was a cause of absenteeism for 8.7% of the respondents to the questionnaire.
authors: Department of Neurosciences, Universidade de São Paulo (FMRP-USP), Ribeirão Preto, Brazil. juliana.dentista@gmail.com
authors: Juliana
authors: J
authors: Stuginski-Barbosa
authors: José Geraldo
authors: JG
authors: Speciali
references: Headache. 1998 Jul-Aug;38(7):497-506
references: 15613165
references: Eur J Neurol. 2002 Mar;9(2):171-4
references: 11882058
references: Headache. 2010 Feb;50(2):231-41
references: 19751369
references: Rev Bras Enferm. 2006 Jul-Aug;59(4):509-13
references: 17340726
references: JAMA. 2003 Nov 12;290(18):2443-54
references: 14612481
references: Headache. 2008 Apr;48(4):553-63
references: 18070057
references: Neurology. 2005 Aug 9;65(3):437-43
references: 16087910
references: Curr Pain Headache Rep. 2009 Feb;13(1):59-63
references: 19126373
references: Eur J Pain. 2006 May;10(4):287-333
references: 16095934
references: Arq Neuropsiquiatr. 1998 Dec;56(4):734-43
references: 10029875
references: Arq Neuropsiquiatr. 2000 Jun;58(2B):431-6
references: 10920404
references: J Occup Rehabil. 2007 Sep;17(3):547-79
references: 17653835
references: J Occup Environ Med. 1997 Apr;39(4):320-7
references: 9113602
references: Cephalalgia. 1999 Mar;19(2):107-14; discussion 74
references: 10214536
references: Cephalalgia. 2006 Feb;26(2):122-7
references: 16426265
references: J Am Osteopath Assoc. 2005 Apr;105(4  Suppl 2):23S-29S
references: 15928350
references: Headache. 2007 Apr;47 Suppl 1:S2-9
references: 17425705
references: Arq Neuropsiquiatr. 2001 Sep;59(3-A):504-11
references: 11588626
references: Lancet. 2005 Sep 3-9;366(9488):843-55
references: 16139660
references: Headache. 2003 Nov-Dec;43(10):1097-101
references: 14629246
references: Neurology. 1999 Sep 11;53(4):868-71
references: 10489058
references: Headache. 1997 Feb;37(2):71-8
references: 9074290
references: Neurology. 2001;56(6 Suppl 1):S1-3
references: 11294953
references: Isr Med Assoc J. 2008 Oct;10(10):676-80
references: 19009944
references: Neurology. 1999 Sep 22;53(5):988-94
references: 10496257
references: Arq Neuropsiquiatr. 2007 Dec;65(4B):1126-9
references: 18345415
references: Headache. 1994 Jun;34(6):319-28
references: 7928310