Table 2 Objective understanding of FOPL as measured by change in correct food product ranking before (without FOPL) and after randomization (with FOPL)

1010

1.99 (1.32–3.00)

0.003

1.14 (0.76–1.70)

0.62

2.33 (1.55–3.51)

< 0.001

1.29 (0.86–1.93)

0.32

699^a

2.31 (1.39–3.83)

0.002

1.16 (0.73–1.86)

0.53

2.46 (1.56–3.88)

< 0.001

1.24 (0.77–2.02)

0.51

957

1.77 (1.09–2.88)

0.05

0.98 (0.61–1.58)

0.93

2.37 (1.45–3.87)

0.003

1.36 (0.84–2.21)

0.32

1000

3.04 (1.74–5.33)

< 0.001

1.57 (0.90–2.72)

0.20

2.90 (1.66–5.08)

0.003

1.67 (0.96–2.91)

0.14

961

1.46 (0.78–2.75)

0.32

1.33 (0.71–2.50)

0.46

1.97 (1.06–3.66)

0.07

0.92 (0.48–1.73)

0.84