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Background: A birth plan (BP) is a written document in which the pregnant woman explains her wishes and expectations about childbirth to the health professionals and aims to facilitate her decision-making. Midwives' support to women during the development of the BP is essential, but it's unknown if shared decision making (SDM) is effective in birth plan counselling. We hypothesized that women who receive counselling based on SDM during their pregnancy are more likely to present their BP to the hospital, more satisfied with the childbirth experience, and have better obstetric outcomes than women who receive standard counselling. We also aimed to identify if women who presented BP to the hospital have better obstetric outcomes and more satisfied with the childbirth experience. Methods: This was a randomised cluster trial involving four Primary Care Units. Midwives provided BP counselling based on SDM to the women in the intervention group (IG) during their pregnancy, along with a leaflet with evidence-based recommendations. Women in the control group (CG) only received the standard birth plan counselling from midwives. The primary outcomes were birth plan presentation to the hospital, obstetrics outcomes and satisfaction with childbirth experience. The Mackey Satisfaction with Childbirth Scale (MCSRS) was used to measure childbirth satisfaction. Results: A total of 461 (95.5%) pregnant women received BP counselling (IG n = 214 and CG n = 247). Fewer women in the intervention group presented their BP to the hospital compared to those in the control group (57.8% vs 75.1%; p <0.001). Mean satisfaction with childbirth experience was high in the IG as well as the CG: 150.2 (SD:22.6) vs. 153.4 (SD:21.8); p = 0.224). The information received about childbirth during pregnancy was high in both groups (95.1% vs 94.8%; p = 1.0). Fewer women in the IG used analgesia epidural compared to those in the CG (84.7% vs 91.7%; p = 0.034); women who combined non-pharmacological and pharmacological methods for pain relief were more in number in the IG (48.9% vs 29.5%; p = 0.001) and women who began breastfeeding in the delivery room were more in number in the IG (83.9% vs 66.3%; p = 0.001). Women who presented their BP had a greater probability of using combined non-pharmacological and pharmacological methods for pain relief aOR = 2.06 (95% CI: 1.30–4.30) and early skin-to-skin contact aOR = 2.08 (95% CI: 1.07–4.04). Conclusion: This counselling intervention was not effective to increase the presentation of the BP to the hospital and women's satisfaction with childbirth; however, it was related to a lower usage of analgesia epidural, a higher combination of pharmacological and non-pharmacological methods for pain relief and the initiation of breastfeeding in the delivery room. Presenting the BP to the hospital increased the likelihood of using pharmacological and non-pharmacological methods for pain relief, and early skin-to-skin contact. [ABSTRACT FROM AUTHOR]

Closed-form exact solutions for the periodic motion of the one-dimensional, undamped, quintic oscillator are derived from the first integral of the nonlinear differential equation which governs the behaviour of this oscillator. Two parameters characterize this oscillator: one is the coefficient of the linear term and the other is the coefficient of the quintic term. Not only the common case in which both coefficients are positive but also all possible combinations of positive and negative values of these coefficients which provide periodic motions are considered. The set of possible combinations of signs of these coefficients provides four different cases but only three different pairs of period-solution. The periods are given in terms of the complete elliptic integral of the first kind and the solutions involve Jacobi elliptic function. Some particular cases obtained varying the parameters that characterize this oscillator are presented and discussed. The behaviour of the periods as a function of the initial amplitude is analysed and the exact solutions for several values of the parameters involved are plotted. An interesting feature is that oscillatory motions around the equilibrium point that is not at x=0 are also considered. [ABSTRACT FROM AUTHOR]