Table 1

Univariable risks associated with perception of fetal movements and late stillbirth risk

Cases, n (%)Controls, n (%)Odds ratio (95% Confidence Interval)* χ2, p values
Was there any time from 26 weeks of pregnancy that your baby’s movements were less than usual?
 No112 (38.7)469 (64.2)Reference: χ2=66.69, p<0.0001
 Once88 (30.5)156 (21.3)2.36 (1.69 to 3.30)
 Two times39 (13.5)65 (6.9)2.51 (1.61 to 3.93)
 Three or more times50 (17.3)41 (5.6)5.11 (3.22 to 8.10)
In the last 2 weeks did the strength of your baby’s movements
 Increase53 (18.3)455 (62.8)0.15 (0.11 to 0.22)
 Decrease62 (21.4)50 (6.9)1.61 (1.05 to 2.46)
 Stay the same153 (52.8)198 (27.3)Reference: χ2=169.96, p<0.0001
 Unsure22 (7.6)22 (3.0)1.29 (0.69 to 2.42)
In the last 2 weeks did the frequency of your baby’s movements
 Increase37 (12.7)254 (34.8)0.38 (0.26 to 0.56)
 Decrease86 (29.6)63 (8.6)3.54 (2.44 to 5.15)
 Stay the same153 (52.6)397 (54.3)Reference: χ2=103.49, p<0.0001
 Unsure15 (5.2)17 (2.3)2.29 (1.12 to 4.70)
During the last 2 weeks did you notice anytime that your baby was more vigorous than usual?
 No182 (62.5)326 (44.7)Reference: χ2=57.39, p<0.0001
 Once41 (14.1)50 (6.9)1.47 (0.94 to 2.31)
 More than once68 (23.4)354 (48.5)0.34 (0.25 to 0.47)
During the last 2 weeks did you feel you baby having hiccups?
 Yes126 (43.5)460 (62.9)0.41 (0.30 to 0.54)
 No141 (48.6)209 (28.6)Reference: χ2=38.10, p<0.0001
 Unsure23 (7.9)62 (8.5)0.55 (0.33 to 0.93)
How often did you feel hiccups in the last 2 weeks?
 Not felt hiccups141 (48.5)209 (28.6)Reference: χ2=42.01, p<0.0001
 Unsure if felt23 (7.9)62 (8.5)0.73 (0.39 to 1.35)
 Once17 (5.8)36 (4.9)0.69 (0.37 to 1.27)
 Occasionally69 (23.7)235 (32.2)0.44 (0.32 to 0.62)
 Daily38 (13.1)177 (24.3)0.32 (0.21 to 0.48)
 Unsure of frequency3 (1.0)11 (1.5)0.37 (0.17 to 0.80)
During the last 2 weeks did you feel uterine contractions (tightenings/prelabour contractions/Braxton Hicks contractions/false labour) for longer than an hour
 Yes94 (32.3)241 (33.0)0.97 (0.72 to 1.29)
 No191 (65.6)473 (64.7)Reference: χ2=0.12, p=0.94
 Unsure6 (2.1)17 (2.3)0.87 (0.34 to 2.25)
Combination of strength and frequency changes in the last 2 weeks (prioritised variable)†
 Increased strength53 (18.2)455 (62.1)0.18 (0.13 to 0.26)
 Increased frequency but not strength8 (2.8)22 (3.0)0.57 (0.25 to 1.32)
 Decreased frequency79 (27.2)36 (4.9)3.45 (2.20 to 5.43)
 Unsure strength or frequency22 (7.6)17 (2.3)2.04 (1.04 to 3.98)
 Same129 (44.3)203 (27.7)Reference: χ2=205.34, p<0.0001
  • 2 and associated p values are given for the overall effect of each variable.

  • †See online supplementary table 1 for detailed description of category’s included in prioritised variable categories.