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. 2019 Jun 12;14(6):e0217583. doi: 10.1371/journal.pone.0217583

Table 6. Fetal movement strength, frequency, hiccups and busy times by gestation at interview.

Interview question Preterm at interview (28+0–36+6 weeks) N = 123 Term at interview (≥37 weeks) N = 151 P
In the last two weeks did the strength of your baby’s movements?
Increase 87 (70.7) 75 (50.0) 0.005
Decrease 4 (3.3) 13 (8.7)
Stay the same 30 (24.4) 59 (39.3)
Unsure 2 (1.6) 3 (2.0)
In the last two weeks did the frequency of your baby’s movements?
Increase 59 (48.0) 48 (31.8) 0.02
Decrease 12 (9.8) 26 (17.2)
Stay the same 49 (39.8) 76 (50.3)
Unsure 3 (2.4) 1 (0.7)
During the last two weeks did you notice any time that your baby was more vigorous than usual?
No 52 (43.3) 75 (51.0) 0.37
Yes, once 7 (5.8) 8 (5.4)
Yes, more than once 56 (46.7) 62 (42.2)
Yes, unsure frequency 5 (4.2) 2 (1.4)
During the last two weeks did you feel your baby having hiccups?
No 34 (27.9) 29 (19.2) 0.04
Yes 81 (66.4) 119 (78.8)
Unsure 7 (5.7) 3 (2.0)
If yes, how often?
Unsure if hiccups 7 (8.3) 3 (2.6) 0.07
Yes, once 8 (9.5) 3 (2.6)
Yes, occasionally 36 (42.9) 53 (45.7)
Yes, daily 31 (36.9) 54 (46.5)
Yes, unsure frequency 2 (2.4) 3 (2.6)
In the last two weeks, how many busy times did your baby have in a day?
0–2 25 (20.3) 35 (23.3) 0.29
3–9 79 (64.2) 101 (67.3)
10+ 19 (15.4) 14 (9.3)
In the last two weeks, on average, how long did these busy times last?
Longer than before 67 (42.7) 58 (31.9) 0.01
About as long as before 85 (54.1) 106 (58.2)
Shorter than before 5 (3.2) 18 (9.9)

Data are n(%). P value is for comparison between preterm and term.