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1.
目的 利用项目反应理论(item response theory,IRT)对《中国版职业紧张核心量表》质量进行分析与评价,为后期量表使用和修订提供参考依据。方法 采用方便抽样方法,抽取湖北省两家三甲医院和多家一、二级医院共1261名医务人员作为研究对象,应用《中国版职业紧张核心量表》调查其职业紧张情况。采用主成分分析验证量表4个维度的单维性。采用IRT中的Same Jima等级反应模型计算每个条目的区分度、难度系数和信息量,从微观角度评价量表的测量特性。结果 量表4个维度均满足单维性假设。IRT结果显示所有条目的区分度较好,取值范围在0.67~3.10;17个条目中有13个条目的难度系数在-2.78~2.30之间,且不存在难度逆反现象,条目9和11难度过高且难度逆反,条目15和16难度过低过高并存且有难度逆反现象,提示待改进;除了条目9、11和15提供的信息量中等,条目16和17提供的信息量较差以外,其余条目的信息量均较好。结论 《中国版职业紧张核心量表》所有条目的区分度较好。从难度系数和信息量两个角度,条目9、11、15、16、17的测验质量均是有待改进的,其余条目性能良好,建议针对上述分析结果结合专家意见对问题条目进行修订。 相似文献
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自发性高血压大鼠血压和左心室肥厚发展过程中去甲肾上腺素、血管紧张素Ⅱ的变化规律(摘要)党爱民,郑德裕,金律高血压左心室肥厚是增加心血管病发病率和死亡率的一个独立危险因子。交感神经系统(SNS)和心脏肾素一血管紧张素系统(RAS)的主要活性成份去甲肾上... 相似文献
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Liu Li-sheng刘力生 Zhao Yi赵毅 Lei Yu-ping雷玉萍Wang Wen王文 Zhang Xiu-e张秀娥and Jin Lu金律CardiOVacular Institute Fuwai Hospital Chinese Academy of Medical Sciences Beijing 《中华医学杂志(英文版)》1989,102(2):106-113
To investigate the effect of Calcium antagonists
(Ca-An) with different tissue specificity in the devel-
opment of hypertension and stroke in salt-loading
SHRSP, three experiments were conducted. In exper-
iment I (1), 50 8-week-old male SHRSP were divided
into three groups and given nifedipine (NF,
32mg / kg /day), menidipine (MN 32mg /
kg / day)and placebo (control group)respectively. In
the controJ group 83.3%(15 / 18)died of stroke and 17
showded renal vascular sclerosis. Their average
lifespan was 84 days. NF and MN significantly re-
duced systolic blood pressure (SBP), and no stroke of
renal vascular sclerosis developed.ln experiment I(2),
54 7-week-old male SHRSP were divided into three
groups (18 in each group). They were treated with
nimodipine (NM)20mg / kg / day, 2mg / kg / day and
placebo respectively. NM (20mg / kg / day) markedly
lowered SBP and postponed the onset of stroke. Only
11% died in 17 weeks. NM (2mg / kg / day did not
lower SBP but postpond the onset of stroke. In exper-
iment 11 (1), 29 10-week-old female SHRSP were di-
vided into three groups: Group A was given NF
32mg / kg / day, group B was parathyoidectomized
(PTX) and group C served as control. PTX group did
not lower SBP but could postpone the onset of
stroke. In experiment Ⅱ (2), 33 male SHRSP were
divided into three groups and ticated as desctibed
above :in experiment Ⅱ (I)(ll in each group). Seven
weeks after the experiment, the brain blood flow of NF
group was significantly greater (67.5%)than that of
the control and PTX groups. In experiment II, 27
7-week-old male SHRSP were divided into three
groups as described above in experiment I(2). Two
weeks after the treatment, significant difference was
found in norepinephrine (NE)contents of the anterior
hypothalamic region (AHR)between NM
(20mg / kg / day)group and control group (2 870 vs
2 304 pg / mg tissue).
Our results show that Ca-An (nimodipine)can re-
verse the NE depletion by high salt in SHRSP, thus
lower SBP and prevent stroke. 相似文献
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本文从血液动力学、血粘度、血象及形态学研究了24条狗内毒素休克发生机制。动物于注射内毒素(ET)后5分钟内血中即出现以血小板为主的微聚物,同时血中血小板、嗜中性白细胞、血压及中心静脉压均下降,血球压积增加,肺中出现微血栓,动物呈呼气性呼吸困难。此变化迅即缓解,动物于 ET 后30′~120′内上述指标逐渐部分恢复。4~6小时内血中又再度出现大量不易解聚的微聚物,上述指标变化加重而导致大部分动物于6小时内死亡,对照组无上述变化。此实验说明微聚物形成在内毒素休克发生中具有重要意义。 相似文献