The promotion of positive mental health and wellbeing of populations and communities is an emerging sphere that includes research, policy development, community action and program activity[1]. This according to World Health Organization in a growing global policy focus is to shift the mental health policy and practice from the sole emphasis on services for those suffering from mental illness to the prevention of mental health problems and the promotion of positive mental health[2]. Focusing on concepts such as wellbeing and its promotion redirects health care to recognize the needs of those with and without pathology to develop characteristic traits that delay falling sick and promote quick recovery and remaining so on to flourishing. Developments of indicator scales of psychological wellness are one of the steps towards the actualization of this shift³. To this end, several scales have been developed and they measure various aspects of positive mental health for research purpose and in assessing practitioners' impact[3].

The Health Scotland in a review of validated scales grouped positive mental health measures into 8 groups according to the aspects of it they purport to measure[4]. These 8 aspects were emotional wellbeing, life satisfaction, optimism and hope, self-esteem, resilience and coping, spirituality, social functioning, and emotional intelligence⁴. Attainment of all these aspects implies increase quality of life, wellbeing and functional capacity till attainments of resilience to illness and other life adversity[5].

In other words, positive mental health is the attainment of emotional resilience[6]. And resilience is a psychological process developed in response to intense life stressors that facilitates healthy functioning[7]. Furthermore, resilience can be described as the quality that allows an individual or group to function well despite the odds against them[6]. Thus resilience connotes inner strength, competence, optimism, flexibility, and the ability to cope effectively when faced with adversity[5, 7].

A core of resiliency and the promotion of mental health is to minimize the impact of risk factors (such as stressful life events) and enhance the protective factors (such as optimism, social support, and active coping) that increase people's ability to deal with life's challenges[6, 8, 9]. Thus a good measure of resilience may go a long way in the assessment of positive mental health in the context of indicators for mental health planning, policy, research and impact treatment and promotional outcomes. Many measuring scales for the study of resilience have been developed and utilized in western countries. These include the Brief Resilience Scale (BRS)[9], Connor-Davidson Resilience Scale (CDRISC)[10], Baruth Protective Factors Inventory (BPFI)[11], Resilience Scale for Adult (RSA)[12], Brief Resilience Coping Scale (BRCS)[13] and Wagnild and Young Resilience Scale (RS)[14].

A review of some of the above instruments revealed RS as the best instrument to study resilience in adolescents[15]. The RS turned out to be the first instrument developed for the study of resilience as well as one of the most widely used and accurate instruments to measure resilience globally[14, 16]. The RS also has been used in many study populations, in several parts of the world, has a 14 item short form (RS-14) and has been translated into other languages [5, 14, 17–19]. Other benefits include ease of use (6^th grade readability), applicability in age group range from adolescent to elderly, and the constructs focus on positive psychological qualities rather than deficits[19].

The above assert that resilience has been well studied in western countries[3–5, 15] and less in developing countries, particularly Nigeria. The challenge of moving forward in terms of resiliency in a developing country like Nigeria, and the need to compare our results with other countries should naturally be preceded by the validation of a measuring scale for resilience. Thus, the aim of this study is to demonstrate the internal consistency and concurrent validity of the RS with its short form (RS-14) in a single Nigerian population.

The purpose of this study is to determine the reliability and validity of RS and RS-14 in Nigerians as a tool that can assess protective factors or resources[17]. The internal consistency of both the RS and RS-14 is high and its concurrent validity is relatively low. Despite the relatively lower correlation value, this study found resilience as measured by both the RS and RS-14 to be negatively correlated with both depressive and anxiety symptoms. This is in accordance with findings in other studies[5, 16–19, 21], that demonstrated fair degree of association by their correlation coefficient's values lying within 0.25-0.5. This study thus supported the hypothesis that resilience is inversely correlated with depression, anxiety and by implication other negative emotional states[5, 21, 22] as well as positive correlation with numerous desired outcomes including physical and emotional wellness[5, 23, 24].

The mean RS by gender in this study (132.04 versus 126.52 i.e. males versus females) is significant and comparable to the Hunter and Chandler study (132.5 versus 122.5)[25]. And echoing Wagnild[5] concern in her review of RS, it is our belief that the differences between males and females with regard to resilience need to be studied. Also the mean RS value in the current study (130.23) is lower than that of the United States (154.4)[19]. This may be accounted for by the choice of study population who were all students and have just concluded a major professional examination compared to the non-students American population with no such experience. Nonetheless, this study mean value is higher than that of the Japanese mean (111.19)[17] which was also among students (nursing and psychology students).

Resilience was construed by Wagnild[19] as meaningful life (purpose), perseverance, self-reliance, equanimity and existential aloneness (i.e. coming home to yourself). We examined these in our study as quality that can confer protectiveness against developing depressive and anxiety symptoms among our study subjects as shown by the significant finding between HADS determined cases and non-cases. Also, resilience should demonstrate good coping in the presence of stressors which the question on the experience of recent life stressors causing distress tried to explore. The significant difference found between those experiencing distress and those not, supported more the hypothesis of resilience as one promoting inner strength and effective coping when faced with adversity. The other question on upcoming life stressors borders on the concept of anticipating stress which this study showed not to be statistically significant.

The results from this study showed that the Wagnild and Young's RS and its short form (RS-14) can be used to measure the concept of resilience in Nigerians. However, the sampling procedure, the small sample size, the skewed distribution of participants as being highly intelligent, the relatively low concurrent validity and the majority of the participants being unmarried do limit it application. In addition to these limitations was the absence of the utilization of other symptoms or traits scales in this study as well as the non-representativeness of the participants to the multi-ethnic diversity of Nigerians. In other words, this study RS mean score cannot be said to be representative of the various ethnic groups in Nigerians. Despite these deficits, both the RS and its short form will be found handy as constructs that measure resilience on its multidimensionality in further studies. In other words, these measuring tools will serve as a useful tool to help Nigerians explored their individual resilience core in health and illness, know where it is weak and take meaningful steps to strengthen it onto wellness[19, 23].

The researchers do conclude that both the RS and RS-14 have high degrees of internal consistency, relatively low concurrent validity with all the other different measure used in this study, and correlate negatively with psychological distress. All these supported the utility of the RS and RS-14 as potentially useful instruments to assess resilience in the Nigerian populations.