J Obstet Gynecol Neonatal Nurs. 2020 Mar;49(2):200-211. doi: 10.1016/j.jogn.2019.12.006. Epub 2020 Feb 6.
To develop and assess the reliability and validity of a new instrument used during the third trimester of pregnancy to measure women's confidence in their ability to achieve physiologic birth, the Preparation for Labor and Birth (P-LAB) instrument.
Two-phase instrument development study that consisted of item generation and a prospective field test.
Field testing occurred in five midwestern U.S. prenatal clinics.
Participants in the field test were 203 nulliparous and parous pregnant women who intended to give birth vaginally.
Psychometric testing consisted of test-retest reliability testing and assessments of content validity, face validity, and construct validity. We measured construct validity using exploratory factor analysis and correlation with the Sense of Coherence Scale.
The 22-item P-LAB showed good content validity, good internal consistency, and stability over time. All items had content validity index scores greater than or equal to 0.8, and the total instrument content validity index was 0.95. We identified four factors related to women's confidence in their ability to achieve physiologic birth: Planned Use of Pain Medication, Relationship With Care Provider and Supportive Birth Environment, Beliefs About Labor, and Labor Support (social and professional). Cronbach's alpha coefficient for the four extracted factors were .93, .76, .73 and .74, respectively. Intraclass correlation [95% confidence interval] for the total questionnaire was .92 [.88, .94]. We found no linear association between total P-LAB scores and sense of coherence.
Our findings demonstrate acceptable initial psychometric properties for the P-LAB instrument. Additional testing is required to evaluate the instrument's construct, convergent, and divergent validity.
开发并评估一种新的工具，用于测量孕妇在妊娠晚期对实现生理性分娩的能力的信心，该工具称为准备分娩和生育（P-LAB）工具，并评估其信度和效度。
由项目生成和前瞻性现场测试组成的两阶段工具开发研究。
现场测试在五个美国中西部的产前诊所进行。
现场测试的参与者是 203 名初产妇和经产妇，她们打算阴道分娩。
心理计量学测试包括重测信度测试以及内容效度、表面效度和结构效度的评估。我们使用探索性因子分析和与心理韧性量表的相关性来衡量结构效度。
22 项 P-LAB 具有良好的内容效度、良好的内部一致性和时间稳定性。所有项目的内容效度指数得分均大于或等于 0.8，总工具内容效度指数为 0.95。我们确定了四个与女性对实现生理性分娩能力的信心相关的因素：计划使用止痛药物、与医护人员的关系和支持性分娩环境、对分娩的信念以及（社会和专业）分娩支持。四个提取因素的 Cronbach's alpha 系数分别为 0.93、0.76、0.73 和 0.74。总问卷的组内相关系数[95%置信区间]为 0.92 [0.88, 0.94]。我们没有发现总 P-LAB 评分与心理韧性之间存在线性关联。
我们的研究结果表明，P-LAB 工具具有可接受的初步心理计量学特性。需要进一步的测试来评估该工具的结构、收敛和发散效度。
