Reducing Ageism in Organizations: A Study Protocol

Measured by the Stereotypes toward Aging at Work Questionnaire (CETV-T), adapted from the CENVE (Blanca et al., 2005). It consists of 20 self-administered items, with a 7-point Likert-type scale (from 1=strongly disagree to 7=strongly agree). It assesses four dimensions related to negative attitudes towards retirement: (1) health, (2) economy, (3) status and (4) leisure/family. The final scores indicate more negative attitudes the higher the value obtained. The full scale has a Cronbach's alpha of 0.80, for the factors, the values obtained are: Leisure/leisure time-family an alpha of 0.836, economy 0.791, status 0.78 and health 0.69 (although this factor has the lowest value it is still considered acceptable within psychometric research standards).

Measured using the Job Satisfaction Scale (JSS) adapted into Spanish (Lukas Mujika et al., 2016). The ESL consists of 15 self-administered items, answered on a 5-point Likert scale (from 1 = strongly disagree to 5 = strongly agree). Higher scores indicate greater job satisfaction and a more positive perception of an inclusive and intergenerational working environment.The scale demonstrates good overall reliability (Cronbach's alpha = 0.802) and has been validated using exploratory and confirmatory factor analysis.

Assessed using the Acceptance and Action Questionnaire-II (AAQ-II) (Bond et al., 2011). The AAQ-II is a 7-item questionnaire designed to assess experiential avoidance and psychological inflexibility. Participants were asked to rate their agreement with each statement on a 7-point Likert scale, ranging from 1 (not at all true) to 7 (completely true). The reliability of this instrument in our sample was high (Cronbach's α = 0.949).

Assessed using the MOS Questionnaire of Perceived Social Support (Sherbourne & Stewart, 1991). It assesses perceived social support. It consists of 20 items. It consists of five factors: support network, emotional/informational social support, instrumental support, positive social interaction and affective support. It has a Likert-type response format of 1 (never) to 5 (always) points. The overall scores range from 20 to 100 points. The higher the score, the more social support the individual perceives. It has a Cronbach's alpha reliability coefficient of 0.97.

Assessed using the Goldberg General Health Questionnaire (GHQ-12) (Goldberg & Williams, 1988; Spanish version of Sánchez-López & Dresch, 2008). It allows us to measure perceived health. It has 12 items with 4 response options, from 0 (better than usual) to 3 (much more than usual). Higher scores correspond to a higher level of perceived health. It has good internal consistency, with Cronbach's alphas varying between 0.82 and 0.86 (Goldberg & Williams, 1988); and the Spanish validation has a Cronbach's alpha of 0.76 (Sánchez-López & Dresch, 2008).

Assessed by the Escala de Autoeficacia Generalizada (EAG) (Baessler & Schwarzer, 1996). It assesses the stable feeling of personal competence to deal effectively with a variety of stressful situations. It consists of 10 items with four Likert-type response options from 1 (incorrect) to 4 (true). Scores range from 10 to 40 points. Higher scores indicate higher levels of self-efficacy. The scale obtained a Cronbach's alpha of 0.81.