Gadsby R
Prof Care Mother Child. 1994 Jan-Feb;4(1):16-7.
A recent prospective study of 363 pregnant women found that 20% had no symptoms of nausea and vomiting, 28% just feel sick, and 52% feel sick and vomited. Symptoms peak at about the ninth week of pregnancy and often stop suddenly by about the 14th week. Two-thirds of women will have similar symptoms in successive pregnancies. Extrapolating from this study, it is likely that 8.5 million working days per year are lost because of pregnancy, nausea and vomiting. "Epsiodic daytime pregnancy sickness" is a more accurate term than "morning sickness" for this condition.
最近一项针对363名孕妇的前瞻性研究发现，20%的孕妇没有恶心和呕吐症状，28%的孕妇只是感觉不适，52%的孕妇感觉不适并伴有呕吐。症状在怀孕约第九周时达到高峰，并通常在约第十四周时突然停止。三分之二的女性在连续怀孕时会出现类似症状。根据这项研究推断，每年可能因怀孕、恶心和呕吐而损失850万个工作日。对于这种情况，“间歇性白天孕期疾病”比“晨吐”是更准确的术语。
