Table 1 Confounding factors and preoperative anamnestic data

Sex

female

51 (63.7 %)

118 (62.1 %)

male

29 (36.3 %)

72 (37.9 %)

Age distribution

11–18 years

5 (6.3 %)

15 (7.9 %)

19–30 year

25 (31.2 %)

66 (34.7 %)

31–50 year

21 (26.2 %)

57 (30.0 %)

51–75 years

29 (36.3 %)

50 (26.3 %)

75 < yr

0 (0 %)

2 (1.1 %)

Frequency of dreaming per week at home

Mean (±SD)

2.69 (±2.19)

2.82 (±2.16)

Repeated dreams

yes

32 (40.0 %)

90 (47.4 %)

none

48 (60.0 %)

100 (52.6 %)

Recalled home dreams

generally recalled

41 (51.2 %)

94 (49.4 %)

sometimes recalled

26 (32.5 %)

63 (33.2 %)

non-recalled

11 (13.8 %)

30 (15.8 %)

no dreams at all

2 (2.5 %)

3 (1.6 %)

Present indication of surgery

accident

22 (27.5 %)

56 (29.5 %)

cancer

19 (23.8 %)

51 (26.8 %)

inflammatory

6 (7.5 %)

8 (4.2 %)

reconstructive

10 (12.5 %)

25 (13.2 %)

other

23 (28.8 %)

50 (26.3 %)

Level of preoperative anxiety

1 (weak)

4 (5.0 %)

6 (3.2 %)

2

11 (13.8 %)

10 (5.3 %)

3

28 (35.0 %)

68 (35.8 %)

4

19 (23.7 %)

55 (28.9 %)

5 (strong)

18 (22.5 %)

51 (26.8 %)

History of anesthesia

yes

54 (67.5 %)

104 (54.7 %)

no

26 (32.5 %)

86 (45.3 %)

Experience by former anesthesia

neutral

24 (44.4 %)

49 (47.1 %)

positive

19 (35.2 %)

40 (38.5 %)

negative

11 (20.4 %)

15 (14.4 %)

Dream during former anesthesia

yes

1 (1.9 %)

11 (10.6 %)

no

53 (98.1 %)

93 (89.4 %)

Recalled dream during former anesthesia

yes

1

7 (63.6 %)

no

0

4 (37.4 %)