Mental Adjustment to Cancer Scale [MAC-40]

Scale Description

The Mental Adjustment to Cancer Scale (MAC-40) is a self-report psychometric instrument developed to assess how individuals with cancer psychologically perceive, cope with, and adjust to their illness and its consequences.

The scale consists of 40 items focusing on cognitive, emotional, and behavioral responses associated with the diagnosis and experience of cancer. Rather than simply classifying psychological adjustment as “good” or “poor,” the MAC-40 examines different coping responses and adjustment strategies adopted by individuals facing cancer.

In its original structure, the MAC assesses five major dimensions: Fighting Spirit, Helplessness/Hopelessness, Anxious Preoccupation, Fatalism, and Avoidance/Denial.

The assessment of these different dimensions provides a more comprehensive understanding of how patients respond psychologically to cancer and to the demands associated with diagnosis, treatment, and the course of the disease.

Objective

The primary objective of the MAC-40 is to assess different patterns of psychological adjustment and coping with cancer.

The scale enables researchers and healthcare professionals to investigate how patients manage the emotional and psychological demands associated with diagnosis, treatment, and disease progression.

MAC-40 scores can also be examined in relation to psychological and health-related variables such as anxiety, depression, quality of life, social support, emotional distress, and other psychosocial or clinical factors.

Assessment of these dimensions may contribute to a better understanding of patients’ psychological needs and support research aimed at developing appropriate psychosocial interventions in oncology settings.

Scoring

The MAC-40 consists of 40 items, which are rated using a Likert-type response format. Responses indicate the extent to which each statement reflects the participant’s thoughts, feelings, or ways of coping with cancer.

Scoring is conducted according to the official scoring key, and separate scores are calculated for the different dimensions of the scale.

A higher score on a particular subscale indicates a stronger presence of the corresponding coping or adjustment pattern. Therefore, higher scores should not automatically be interpreted as representing better overall psychological adjustment.

Interpretation should be conducted at the level of the individual dimensions and in accordance with the scoring procedures of the specific MAC version being administered.

Data Analysis

Statistical analysis of MAC-40 data may include the calculation of individual subscale scores and their presentation through descriptive statistics such as means, standard deviations, medians, and ranges.

The internal consistency of the dimensions can be evaluated using reliability coefficients such as Cronbach’s alpha or, where appropriate, McDonald’s omega.

Subscale scores may also be examined in relation to sociodemographic and clinical characteristics, including age, sex, cancer type, disease stage, time since diagnosis, and type of treatment.

Depending on the research objectives, statistical procedures may include correlation analysis, comparisons between independent groups, regression models, or multivariate analyses. In psychometric studies, exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) may also be employed to examine the underlying structure of the instrument.

Applications

The MAC-40 has been widely used in psycho-oncology and research on psychological adjustment to cancer.

It can be applied to investigate coping patterns across different groups of patients, examine the psychological impact of cancer, and explore relationships between coping strategies, emotional distress, and health-related quality of life.

In longitudinal research, the scale may also be used to examine potential changes in coping and adjustment patterns during treatment or across different stages of the cancer experience.

The MAC-40 is an instrument for assessing psychological responses and should not be used as a stand-alone diagnostic tool. Interpretation of its results should take into account the individual’s broader clinical, psychological, social, and cultural context.

Psychometric Properties

The reliability and validity of the MAC have been investigated across different populations and cultural contexts. When translated or culturally adapted versions are used, it is important to evaluate their internal consistency, factor structure, construct validity, and conceptual equivalence within the population under investigation.

Cross-cultural adaptation should extend beyond direct linguistic translation and should ensure that the conceptual meaning of the original items is adequately maintained while preserving the psychometric properties of the instrument.

References

Watson, M., Greer, S., Young, J., Inayat, Q., Burgess, C., & Robertson, B. (1988). Development of a questionnaire measure of adjustment to cancer: The MAC scale. Psychological Medicine, 18(1), 203–209.

Greer, S., Moorey, S., & Watson, M. (1989). Patients’ adjustment to cancer: The Mental Adjustment to Cancer (MAC) scale vs clinical ratings. Journal of Psychosomatic Research, 33(3), 373–377.

Watson, M., Law, M., dos Santos, M., Greer, S., Baruch, J., & Bliss, J. (1994). The Mini-MAC: Further development of the Mental Adjustment to Cancer Scale. Journal of Psychosocial Oncology, 12(3), 33–46.

Watson, M., & Homewood, J. (2008). Mental Adjustment to Cancer Scale: Psychometric properties in a large cancer cohort. Psycho-Oncology, 17(11), 1146–1151.