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? No 112 (38.7) 469 (64.2) Reference: χ2=66.69, p<0.0001 Once 88 (30.5) 156 (21.3) 2.36 (1.69 to 3.30) Two times 39 (13.5) 65 (6.9) 2.51 (1.61 to 3.93) Three or more times 50 (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 Increase 53 (18.3) 455 (62.8) 0.15 (0.11 to 0.22) Decrease 62 (21.4) 50 (6.9) 1.61 (1.05 to 2.46) Stay the same 153 (52.8) 198 (27.3) Reference: χ2=169.96, p<0.0001 Unsure 22 (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 Increase 37 (12.7) 254 (34.8) 0.38 (0.26 to 0.56) Decrease 86 (29.6) 63 (8.6) 3.54 (2.44 to 5.15) Stay the same 153 (52.6) 397 (54.3) Reference: χ2=103.49, p<0.0001 Unsure 15 (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? No 182 (62.5) 326 (44.7) Reference: χ2=57.39, p<0.0001 Once 41 (14.1) 50 (6.9) 1.47 (0.94 to 2.31) More than once 68 (23.4) 354 (48.5) 0.34 (0.25 to 0.47) During the last 2 weeks did you feel you baby having hiccups? Yes 126 (43.5) 460 (62.9) 0.41 (0.30 to 0.54) No 141 (48.6) 209 (28.6) Reference: χ2=38.10, p<0.0001 Unsure 23 (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 hiccups 141 (48.5) 209 (28.6) Reference: χ2=42.01, p<0.0001 Unsure if felt 23 (7.9) 62 (8.5) 0.73 (0.39 to 1.35) Once 17 (5.8) 36 (4.9) 0.69 (0.37 to 1.27) Occasionally 69 (23.7) 235 (32.2) 0.44 (0.32 to 0.62) Daily 38 (13.1) 177 (24.3) 0.32 (0.21 to 0.48) Unsure of frequency 3 (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 Yes 94 (32.3) 241 (33.0) 0.97 (0.72 to 1.29) No 191 (65.6) 473 (64.7) Reference: χ2=0.12, p=0.94 Unsure 6 (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 strength 53 (18.2) 455 (62.1) 0.18 (0.13 to 0.26) Increased frequency but not strength 8 (2.8) 22 (3.0) 0.57 (0.25 to 1.32) Decreased frequency 79 (27.2) 36 (4.9) 3.45 (2.20 to 5.43) Unsure strength or frequency 22 (7.6) 17 (2.3) 2.04 (1.04 to 3.98) Same 129 (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.