5 research outputs found
Stratified Analysis of Maternal Age and Risk of Cesarean Section
<p>Adjusted odds ratio for a 5-y increase in maternal age (bars are 95% CIs) stratified by maternal age, year of delivery, week of gestation, and deprivation category. Interactions were statistically significant for year of delivery (<i>p</i> < 0.001), week of gestation (<i>p</i> = 0.002), and deprivation category (<i>p</i> = 0.002) using the likelihood ratio test. Odds ratios are adjusted for maternal age, height, deprivation category, onset of labor, week of gestation, sex, birth weight percentile of infant, and year. The vertical dashed line indicates unity.</p
Time Trends in Maternal Age Distribution and Cesarean Section Rates in Scotland between 1980 and 2005
<div><p>(A) Proportion of women per year delivering within the age ranges 30–34, 35–39, and ≥40 y.</p>
<p>(B) Proportion of women per year delivered by emergency cesarean section.</p></div
Maternal Age and the Risk of Cesarean Delivery
<p>Proportion of women being delivered by emergency intrapartum cesarean section in relation to age of mother (<i>n</i> = 583,847). Bars are binomial 95% CIs.</p
Myometrial Contractility in Relation to Maternal Age
<div><p>(A) Trace of isometric tension from myometrial strip obtained from a 40-y-old woman being delivered by planned cesarean section. The blue line represents the 15 min before addition of potassium, and the red line 7 min in the presence of 50 mM of potassium. The area under the curve is the space between the tension trace and the baseline, indicated by the blue and red lines. The log<sub>10</sub> of the ratio of these two areas is the contraction unit. The spontaneous contraction before the addition of potassium and the contraction following potassium being washed out are both multiphasic.</p>
<p>(B) Mean spontaneous contractile activity (quantified as contraction units) of isolated strips of myometrium obtained from women (<i>n</i> = 62) at the time of planned cesarean section in relation to the age of the donor. Regression line: <i>y</i> = 0.1078 + (−0.0174 × age); 95% CI for slope, −0.0326 to −0.0022.</p>
<p>(C) Proportion of spontaneous contractions that were multiphasic in relation to maternal age (<i>n</i> = 62, 181 samples). See text for regression analysis of (B) and (C).</p></div
Maternal Age and the Duration of Labor and Risk of Operative Vaginal Birth
<div><p>(A) Mean duration of spontaneous labor in relation to maternal age (<i>n</i> = 409,703). Bars are 95% CIs of the mean.</p>
<p>(B) Proportion of nulliparous women who required operative vaginal delivery in relation to maternal age among the 518,787 women delivered by a means other than emergency cesarean section. Bars are binomial 95% CIs.</p></div