Table 1 The prevalence of tension headache and migraine (arranged in ascending order of latitude)

Singapore (Nationwide)

Ho et al. (2003) [10]

2,096

1N

13

3

San Pablo del Lago (Ecuador)

Cruz et al. (1995) [11]

2,723

1S

2.8

Mbulu, Manyara, Tanzania (Africa)

Winkler et al. (2009) [12, 13]

7,412

3S

Gbêcon-Hounli, Abomey, Benin (Africa)

Houinato et al. (2010) [14]

1,113

7N

Central Ethiopia

Tekle haimont et al. (1995) [15]

15,000

9N

Ibadan (Nigeria)

Osuntokun et al. (1992) [16]

18,954

8N

Nachingwea (Tanzania) (Africa)

Dent et al. (2004) [17]

3,351

10S

Cuzco (Peru)

Jaillord et al. (1997) [18]

3,246

13S

Pureto Rico

Miranda et al. (2003) [19]

1,610

18N

Hongkong (Nationwide)

Cheung (2000) [20]

1,436

22N

Eastern province (Thugabah) (Saudi Arabia)

Al Rajeh et al. (1997) [21]

22,630

22N

9.5

Ad Dakhliyah (Oman)

Delu et al. (2002) [22]

1,158

23N

Taipei (Taiwan)

Wang et al. (2000) [23]

3,377

25N

Qassim (Saudi Arabia)

Abduljabbar et al. (1996) [24]

5,891

25N

3.1

Porto Alegre (Brazil)

Wiehe et al. (2002) [25]

1,174

30S

Jordan (Nationwide)

Alzoubi et al. (2009) [26]

4,836

31N

Santiago Chile

Lavadose et al. (1997) [27, 28]

1,385

33S

Daisen (Japan)

Takeshima et al. (2003) [29]

4,795

35N

Korea (Nationwide)

Roh et al. (1998) [30]

2,500

37N

Baltimore, Atlanta, and Philadelphia (USA)

Bigal et al. (2006) [31]

30,215

39N

Maryland (USA)

Stewart et al. (1996) [32]

12,328

39N

Maryland (USA)

Schwartz et al. (1998) [33, 34]

13,345

39N

Philadelphia (USA)

Lipton et al. (2002) [35]

4,376

39N

Sivas (Turkey)

Kececi et al. (2002) [36]

947

39N

Ederin (Turkey)

Celik et al. (2005) [37]

386

41N

Tbilisi and Kakheti (Georgia)

Katsarava et al. (2009) [38]

1,145

41N

Bakar (Croatia)

Zivadinov et al. (2001), (2003) [39, 40]

3,794

45N

34.8

Doetinchem & Maastricht (Netherlands)

Launer et al. (1999) [41]

6,491

51N

Mainland (UK)

Steiner et al. (2003) [42]

4,007

52N

Copenhagen

Rasmussen et al. (1991) [43]

740

55N

78

Akershus, Hedmark or Oppland (Norway)

Russell et al. [2008] [44]

2,177

63N

Nord-Trundelag (Norway)

Hagen et al. (2000) [45]

51,383

63N

Svalbard

Lilleng et al. (2009) [46]

1,029

77N