observational study

• 观察研究

observational study的用法和样例：

例句

1. Pacifier use was associated with reduced duration of breast-feeding in most observational studies.
   在多数观察研究中，使用安抚奶嘴与减少母乳哺喂期间有关。
2. This was an observational study and therefore treatment strategy was not randomised but left to the discretion of the individual doctor or the patient.
   这是一个观察研究，而且治疗策略也不随机，但它留给医生或患者很多思考。