Gazi-Coklica V, Muretić Z
Stomatoloskog Fakulteta u Zagrebu.
Acta Stomatol Croat. 1991;25(3):135-42.
The study was carried out in two age-matched groups of patients from two different periods of time. The aim of the study was to determine whether any craniofacial system alterations attributable to the influence of secular trend had occurred during a defined period of time. Four basic craniofacial variables, from which the craniofacial indices were derived, were measured. The findings were statistically processed by the basic parameter evaluation and testing of differences of arithmetical means of the same variables between the two study groups. The results showed the following alterations to have occurred during a 13-year period due to the secular trend effects: cranial indices decreased, mostly by a significant cranial length increase (g-op); and facial indices decreased, mostly by a facial height decrease (n-gn).
该研究在来自两个不同时期的两组年龄匹配的患者中进行。研究目的是确定在特定时间段内是否发生了任何可归因于长期趋势影响的颅面系统改变。测量了四个基本的颅面变量，由此得出颅面指数。通过基本参数评估以及对两个研究组相同变量算术平均值差异的检验对研究结果进行了统计学处理。结果显示，由于长期趋势效应，在13年期间发生了以下改变：颅指数下降，主要是由于颅骨长度显著增加（g-op）；面指数下降，主要是由于面高降低（n-gn）。
