TABLE 5.

Significant Risk Factors at 6 Weeks

VariableCase (n = 32; n [%])Control (n = 168; n [%])Univariate OR (95% CI, P Value)Multivariate OR (95% CI, P Value)
Limitation of passive rotation - newborn (missing = 16)χ2 = 12.52, P = .0004χ2 = 11.50, P = .0007
    Limited7 (25.0)8 (5.1)6.17 (2.03–18.76)9.51 (2.59–34.94)
    Not limited21 (75.0)148 (94.9)1.001.00
Reported preferential head orientation (missing = 2)χ2 = 3.19, P = .07
    Yes23 (71.9)91 (54.8)2.11 (0.92–4.83)
    No9 (28.1)75 (45.2)1.00
Sleep position at newborn interviewP < .0001
    Supine only30 (93.8)95 (56.5)11.53 (2.67–49.81)
    Nonsupine2 (6.2)73 (43.5)1.00
Sleep position at 6 wkχ2 = 11.79, P = .0006χ2 = 9.25, P = .003
    Supine only26 (81.3)81 (48.2)4.65 (1.82–11.89)5.27 (1.81–15.39)
    Nonsupine6 (18.7)87 (51.8)1.001.00
Head position variedχ2 = 10.94, P = .004
    Yes10 (31.2)103 (61.3)1.00
    No12 (37.5)45 (26.8)2.75 (1.11–6.82)
    Tried but unsuccessful10 (31.2)20 (11.9)5.15 (1.90–13.98)
Back time per dayχ2 = 8.57, P = .003
    < 21 h16 (50.0)128 (76.2)1.00
    ≥ 21 h16 (50.0)40 (23.8)3.20 (1.47–6.97)
Upright time per dayχ2 = 4.90, P = .03χ2 = 6.88, P = .009
    ≤ 1 h9 (28.1)83 (49.4)1.001.00
    > 1 h23 (71.9)85 (50.6)2.50 (1.08–5.56)3.99 (1.42–11.23)
Backtime per day (h)19.01 (4.13)14.89 (6.52)P < .0001
β = 0.14 (0.05–0.22)