BackgroundPrenatal depression can negatively affect the physical and mental health of both mother and fetus. The aim of this study was to determine the effectiveness of yoga as an intervention in the management of prenatal depression.MethodsA systematic review and meta-analysis of randomized controlled trials (RCTs) was conducted by searching PubMed, Embase, the Cochrane Library and PsycINFO from all retrieved articles describing such trials up to July 2014.ResultsSix RCTs were identified in the systematic search. The sample consisted of 375 pregnant women, most of whom were between 20 and 40 years of age. The diagnoses of depression were determined by their scores on Structured Clinical Interview for DSM-IV and the Center for Epidemiological Studies Depression Scale. When compared with comparison groups (e.g., standard prenatal care, standard antenatal exercises, social support, etc.), the level of depression statistically significantly reduced in yoga groups (standardized mean difference [SMD], −0.59; 95% confidence interval [CI], −0.94 to −0.25; p = 0.0007). One subgroup analysis revealed that both the levels of depressive symptoms in prenatally depressed women (SMD, −0.46; CI, −0.90 to −0.03; p = 0.04) and non-depressed women (SMD, −0.87; CI, −1.22 to −0.52; p < 0.00001) were statistically significantly lower in yoga group than that in control group. There were two kinds of yoga: the physical-exercise-based yoga and integrated yoga, which, besides physical exercises, included pranayama, meditation or deep relaxation. Therefore, the other subgroup analysis was conducted to estimate effects of the two kinds of yoga on prenatal depression. The results showed that the level of depression was significantly decreased in the integrated yoga group (SMD, −0.79; CI, −1.07 to −0.51; p < 0.00001) but not significantly reduced in physical-exercise-based yoga group (SMD, −0.41; CI, −1.01 to −0.18; p = 0.17).ConclusionsPrenatal yoga intervention in pregnant women may be effective in partly reducing depressive symptoms.Electronic supplementary materialThe online version of this article (doi:10.1186/s12888-015-0393-1) contains supplementary material, which is available to authorized users.
Green tea is a commonly consumed beverage in Asia and has been suggested to have anticarcinogenic properties. To date, epidemiological evidence of the effect of green tea consumption on liver cancer risk remains ambiguous. The aim of this meta-analysis is to evaluate the association between green tea consumption and the risk of liver cancer. The summary relative risk for the highest consumption (≥5 cups/day) of green tea on liver cancer incidence compared with nondrinkers was 0.62 (95% confidence interval: 0.49-0.79). We also found a trend that the incidence of liver cancer was reduced with the increasing years of green tea intake (significance at >20 yr). A significant dose-response association was found between green tea drinking and liver cancer risk. The downward trend was most obvious when the consumption of green tea increased up to about 4 cups/day. The results showed that the increasing green tea intake may have a preventive effect against liver cancer.
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