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. 2010 Oct 1;33(10):1363–1371. doi: 10.1093/sleep/33.10.1363

Table 5.

Adjusted mean (SE) mean arterial pressure (MAP), by trimester and nightly hours of sleep during early pregnancy, after stratification by parity, Seattle, Washington, 2003 - 2006

First Trimester
Second Trimester
Third Trimester
All Women (N = 1,272)
Sleep group h/night 1Adjusted Mean [SE] Δ (95% CI) 1Adjusted Mean [SE] Δ (95% CI) 1Adjusted Mean [SE] Δ (95% CI)
    9 h 80.42 [0.36] 80.17 [0.32] 82.59 [0.38]
    ≤ 6 h 81.51 [0.57] 1.09 (0.0 to 2.2) 80.22 [0.56] 0.05 (−1.0 to 1.1) 85.77 [0.59] 3.18 (2.0 to 4.3)
    7-8 h 80.81 [0.40] 0.39 (−0.4 to 1.2) 79.70 [0.38] −0.47 (−1.2 to 0.3) 84.79 [0.40] 2.20 (1.4 to 3.0)
    ≥ 10 h 81.06 [0.61] 0.64 (−0.6 to 1.8) 80.29 [0.54] 0.12 (−0.9 to 1.2) 86.24 [0.61] 3.65 (2.5 to 4.8)
Nulliparous Women (N = 771)
Sleep group h/night 2Adjusted Mean [SE] Δ (95% CI) 2Adjusted Mean [SE] Δ (95% CI) 2Adjusted Mean [SE] Δ (95% CI)
    9 h 79.64 [0.62] 76.78 [0.93] 82.08 [0.86]
    ≤ 6 h 81.45 [0.84] 1.81 (0.2 to 3.4) 75.68 [1.24] −1.10 (−3.5 to 1.3) 86.62 [1.05] 4.55 (2.5 to 6.6)
    7-8 h 80.28 [0.68] 0.66 (−0.7 to 2.0) 72.78 [0.78] −4.00 (−5.5 to 2.5) 84.50 [0.70] 2.42 (1.0 to 3.8)
    ≥ 10 h 81.07 [0.94] 1.44 (−0.4 to 3.3) 74.88 [1.11] −1.90 (−4.1 to 0.3) 87.01 [0.89] 4.93 (3.2 to 6.7)
Multiparous Women (N = 501)
Sleep group h/night 3Adjusted Mean [SE] Δ (95% CI) 3Adjusted Mean [SE] Δ (95% CI) 3Adjusted Mean [SE] Δ (95% CI)
    9 h 80.17 [0.65] 75.32 [1.17] 79.63 [0.80]
    ≤ 6 h 80.26 [1.04] 0.11 (−1.9 to 2.1) 69.70 [1.37] −5.63 (−8.3 to 2.9) 80.48 [1.04] 0.95 (−1.1 to 3.0)
    7-8 h 80.13 [0.71] −0.04 (−1.4 to 1.4) 71.62 [0.78] −3.70 (−5.2 to 2.2) 79.75 [0.73] 0.22 (−1.2 to 1.7)
    ≥ 10 h 80.07 [1.22] −0.10 (−2.5 to 2.3) 72.77 [1.58] −2.55 (−5.6 to 0.5) 81.56 [1.12] 2.22 (−0.2 to 4.2)
1

Adjusted for maternal age, race/ethnicity, parity, educational attainment, and pre-pregnancy body mass index. The adjusted mean values reported are from a regression model based on the entire study cohort (N = 1,272) with indicators variables specified to represent Non-Hispanic white, nulliparous, college educated women 25-34 years of age, with a pre-pregnancy BMI < 25 kg/m2.

2

Adjusted for maternal age, race/ethnicity, educational attainment, and pre-pregnancy body mass index. The adjusted mean values reported are from a regression model based on nulliparous women only (N = 771) with indicators variables specified to represent Non-Hispanic white, college educated women 25-34 years of age, with a pre-pregnancy BMI < 25 kg/m2.

3

Adjusted for maternal age, race/ethnicity, educational attainment, and pre-pregnancy body mass index. The adjusted mean values reported are from a regression model based on multiparous women only (N = 501) with indicator variables specified to represent Non-Hispanic white, college educated women 25-34 years of age, with a pre-pregnancy BMI < 25 kg/m2.