Considering the issues above, this experimental study of empirical nature investigated middle-aged monolinguals and bilinguals matched in age, education and profession (businesspeople), in two nonverbal cognitive tasks.
But they're closely matched in age.
In parallel, a population-based sample of community-dwelling individuals without stroke, frequency matched in age and city district, were also recruited.
The control group consisted of 44 women among the 206 with similar uterine malformations who had normal bilateral kidneys and matched in age and parity with the study group.
This study employed a 2 × 2 experimental design to explore this issue in greater depth, with 55 Internet addicts and 55 healthy controls that were well matched in age and gender.
Patients (n = 300) and controls were matched in age and gender.
Twenty-eight healthy control subjects matched in age and sex were recruited at the same time.
The control subjects were closely matched in age, sex, and craniofacial morphology with the experimental subjects (Table 1).
They were matched in age (36 – 58) and education (they all had at least one university degree), and were all right-handed.
Another 12 right-handed normal subjects matched in age, gender and education level were recruited to serve as healthy control (HC).
They then pitted the speech discrimination abilities of these performers against 14 nonmusicians matched in age, gender, and general language ability.
