This study aimed to examine the convergent validity of the SSTICS. The association between the SSTICS and the five-factor model of the PANSS was also examined. One hundred and seventy-six schizophrenia-spectrum disorder patients were recruited. A correlation analysis was performed. The SSTICS score correlated with the score on the FPSES. The SSTICS score also correlated with the cognition factor of the PANSS. Our results demonstrate that the SSTICS is a good instrument for evaluating the subjective complaints of patients with schizophrenia. They also reveal good concordance between cognitive impairments experienced by patients and cognitive disorders assessed by a clinical rater.