Of the 306 persons surveyed, 158 (51.6%) reported the appearance of a new headache during the period of study, of whom 65 (41.1%) had previously had a headache (migraine: 27 (17.1%), tension: 26 (16.5%) and others: 11 (6.9%)). There were 103 (33.7%) subjects who did not observe the appearance of a new headache. A 14.7% were undecided on the answer ‘I don't know’ or the answer was ‘maybe’; these 45 subjects were eliminated from the analysis.