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Table 1 Nightmare frequency in last trimester of pregnancy (N = 397) and in a representative sample of women (N = 496)

From: Nightmare frequency in last trimester of pregnancy

Category Pregnant women Representative sample
Several times a week 4.53 % 0.60 %
About once a week 6.80 % 1.61 %
Twice or three times a month 14.61 % 6.65 %
About once a month 19.40 % 6.45 %
About two to four times a year 21.16 % 10.08 %
About once a year 7.30 % 8.87 %
Less than once a year 7.30 % 19.96 %
Never 18.89 % 45.77 %