Table 5: Factor analysis.

Paper Factor analysis Eigen value
Moerman, et al. 1996 [10] Anxiety 3.07
Need for information 1.25
Mohd Fahmi, et al. 2015 [17] Anxiety 4.1
Need for information 1
Nishimori, et al. 2002 [14] Anxiety 2.92
Need for information 1.30
Buonanno, et al. 2017 [18] Anxiety 3.41
Need for information 1.15
Berth, et al. 2007 [20] Anxiety > 1
Need for information > 1
Maurice-Szamburski, et al. 2013 [12] Anxiety about anaesthesia Not determined
Anxiety about surgery Not determined
Need for information Not determined