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Table 3 Demonstrates the city or geographical periphery where each study was performed, the geographic latitude in degrees, the age at menarche in years, and the author and year of publication.

From: Association between adolescent idiopathic scoliosis prevalence and age at menarche in different geographic latitudes

City or Geographical Periphery Geographic Latitude in degrees Age at menarche in years Author and year of publication
Oslo (Norway) 59,93 16,00 Rosenberg 1991 [21]
Copenhagen (Denmark) 55,43 13,40 Helm P & Grolund L 1998 [22]
Rotterdam (Netherlands) 51,55 13,15 Mul et al 2001 [23]
Brussels (Belgium) 50,51 13,00 Vercauteren M & Susanne C 1984 [24]
Switzerland 47,00 13,40 Largo RH & Prader A 1983 [25]
Pecs (Hungary) 46,00 12,90 Dober I & Kiralyfalvi L 1993 [26]
Zagreb (Croatia) 45,48 13,13 Prebeg Z & Bralic I 2000 [27]
L' Aquila (Italy) 42,36 12,55 Danubio et al 2004 [28]
Madrid (Spain) 40,26 12,79 Marroban MD, Mesa MS 2000 [29]
Coimbra (Portugal) 40,15 12,53 Padez C & Rocha MA 2003 [30]
Dayton (Ohio, USA) 40,13 12,43 Chumlea et al 2003 [31]
Sardinia (Italy) 40,00 12,78 Floris G et al 1987 [32]
Athens (Greece) 38,00 12,58 Dacou-Voutetakis et al 1983 [33]
Thriasion Pedion, (Greece) 37,50 12,07 Grivas et al 2002 [34]
Columbia (USA) 38,53 13,20 Vadocz EA et al 2002 [35]
Atlanta (Georgia, USA) 33,46 12,60 Freedman et al 2002 [36]
Marrakech (Morocco) 31,49 13,04 Montero P et al 1999 [37]
Texas (USA) 31,14 13,10 Malina RM et al 1994 [38]
Chandigarh (India) 30,72 13,20 Sharma K 1990 [39]
Patiala (India) 30,35 12,54 Singh SP & Malhotra P 1988 [40]
Cairo (Egypt) 30,05 12,59 Attallah NL 1978 [41]
Shiraz (Iran) 29,38 12,84 Ayatollahi SM et al 2002 [42]
Zhejiang (China) 28,45 12,80 Hesketh T et al 2002 [43]
Hong Kong (China) 22,45 12,38 Huen KF et al 1997 [44]
Dominican Republic 19,00 13,10 Mancebo P et al 1990 [45]
Khartoum (Sudan) 15,55 13,35 Attallah NL et al 1983 [46]
Bangkok (Thailand) 13,73 12,35 Chompootaweep S et al 1997 [47]
Hausa (Nigeria) 12,24 13,50 Rehan N 1994 [48]
Carabobo (Venezuela) 10,23 12,86 Farid-Coupal N et al 1981 [49]
Nigeria 10,00 13,70 Oduntan SO et al 1976 [50]
Jaffna (Sri Lanka) 9,66 13,78 Prakash S & Pathmanathan G 1984 [51]
Kumasi (Ghana) 6,75 13,98 Adadevoh SW et al 1989 [52]
Yaunde (Cameroon) 3,85 13,98 Pasquet P et al 1999 [53]