Table 4 Crude and adjusted OR (95% CI) of selected spectator and movie vision characteristics and visually induced symptoms after the vision of a 3D movie. Adjusted for age, gender, educational level, employment status and movie appreciation

Use of glasses or prescription lenses

Crude OR Adjusted OR

0.75(0.54-1.06) § 0.78(0.55-1.10) §

1.06 (0.74-1.51) 1.08(0.75-1.55)

1.66 (0.92-3.01)° 1.67(0.92-3.06)§

1.21 (0.66-2.23) 1.25(0.67-2.32)

Headache often and very often

Crude OR Adjusted OR

1.12 (0.82-1.52) 1.10(0.81-1.51)

1.80 (1.29-2.52)** 1.81(1.29-2.54)**

1.28 (0.72-2.30)§ 1.07(0.59-1.95)

1.60 (0.90-2.85)§ 1.39(0.78-2.52)

Carsickness often and very often

Crude OR Adjusted OR

0.66 (0.46-01.01) 0.67(0.46-0.97)*

1.54 (1.08-2.19)* 1.57(1.09-2.26)*

1.99 (1.10-3.60)* 1.72(0.93-3.16)°

2.73 (1.53-4.88)** 2.82(1.54-5.18)**

Recurrent vertigo >1 episode per month

Crude OR Adjusted OR

1.28 (0.84-1.97) 1.17(0.75-1.82)

1.94 (1.26-3.01)* 1.73(1.10-2.71)*

3.30 (1.73-6.28)** 2.72(1.39-5.34)**

1.76 (0.85-3.63)§ 1.68(0.79-3.58)§

Use of computer or videogame console > 5 h per day

Crude OR Adjusted OR

0.92 (0.66-1.28) 0.86(0.61-1.22)

0.99 (0.69-1.42) 1.02(0.69-1.49)

0.93 (0.49-1.76) 0.90(0.45-1.79)

1.33 (0.73-2.43) 1.17(0.61-2.24)

Self perceived high anxiety level

Crude OR Adjusted OR

1.69 (1.12-2.54)* 1.58(1.04-2.40)*

2.16 (1.41-3.30)** 1.96(1.26-3.04)**

1.03 (0.60-2.86) 1.02(0.46-2.29)

0.89 (0.37-2.14) 0.83(0.34-2.04)

Showtime (movie starting time ≥22.30)

Crude OR Adjusted OR

1.16(0.84-1.60) 1.04(0.75-1.46)

1.63(1.15-2.29)* 1.43(0.99-2.04)°

0.82(0.43-1.58) 0.78(0.39-1.56)

0.63(0.32-1.26)§ 0.62(0.30-1.29)

Movie type: animation movie

Crude OR Adjusted OR

0.80 (0.59-1.09)§ 0.86(0.62-1.18)

0.68 (0.49-0.96)* 0.75(0.53-1.1)°

1.18(0.64-2.19) 1.22(0.64-2.32)

0.84 (0.47-1.51) 0.81(0.44-1.51)

Position during vision: close to the screen

Crude OR Adjusted OR

1.25 (0.73-2.13) 1.20(0.70-2.05)

1.12 (0.62-2.03) 1.06(0.58-1.94)

0.76(0.23-2.52) 0.76(0.23-2.55)

0.75 (0.23-2.46) 0.75(0.23-2.51)

Movie duration >100 min

Crude OR Adjusted OR

0.91 (0.67-1.24) 0.94(0.69-1.29)

0.90 (0.64-1.26) 0.92(0.65-1.31)

1.03 (0.57-1.89) 1.06(0.57-1.97)

1.18 (0.64-2.15) 1.09(0.59-2.03)