Table 3 Proportions and adjusted odds ratios (OR) of correct answers to the first five knowledge questions: comparing non-invasive prenatal testing (NIPT) before 15 weeks versus after 15 weeks and with advanced education versus without

1. Comparison with invasive test

71.5

62.5

0.125

2.1 (0.8–5.3)

77.8

68.9

0.262

1.5 (0.7–3.3)

2. Not 100 % detection

95.1

75.0

0.001*

6.2 (1.6–23.7)*

96.7

82.2

0.004*

5.6 (1.3–23.1)*

3. False-positive results

92.8

79.2

0.04*

3.4 (1.0–11.5)*

92.2

86.7

0.302

1.0 (0.6–6.3)

4. Stressful if positive

97.3

87.5

0.035*

5.6 (0.9–33.8)

98.9

88.9

0.008*

13.6 (1.5–125.5)*

5. May not be informative

74.8

58.5

0.104

2.1 (0.9-5.3)

75.6

64.4

0.176

1.6 (0.7–3.5)