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the intensity of the symptoms and indicates the characteristic style of the person to express psychic suffering (the score ranges from 0 to 4, high scores indicating greater psychological distress). The SCL-90-R-Spanish version showed adequate reliability (α between .81 and .90) and validity (González de Rivera et al., 2002). Procedure The participants were individually screened via an interview focused on socio-demographic data, clinical data about FM, life history, personal relationships, lifestyle, and psychological status. After the interview, participants were given a battery of questionnaires to be completed at home and returned within a week. The way to fi ll in the questionnaires was explained and exemplifi ed upon delivery, and possible doubts/omissions were resolved upon collection. All subjects were informed about the study and gave their written informed consent. The study was approved by the Ethics Committee of the University of Granada. Data Analysis All data were analyzed with the SPSS 22.0 statistical package and the ModGraph-I a program that graphically displays moderation effects (Jose, 2013). Two groups were established according to the degree of impairment (FIQ) (severe ≥ 59 and moderate-mild < 59), and the differences between both were examined via Student’s t-test. Effect size was estimated with Cohen’s d. To examine the associations between variables Pearson’s correlation coeffi cient was used. Several linear regression analyses (enter method) were performed to determine the contribution of psychopathology dimensions to predict pain intensity, poor sleep quality and impairment. For testing moderation effects the guidelines by Frazier et al. (2004) were followed. Several hierarchical regression analyses were conducted considering impairment as dependent variable (DV), pain intensity and poor sleep quality as predictors, psychopathology as moderator, and the interaction of predictor x moderator. To reduce multicollinearity, the predictors and moderator variables were centered. The interaction term was obtained by multiplying the centered scales. As a post-hoc analysis of the moderation effects, several simple slopes were computed for low (-1SD), medium, and high (+1SD) levels of psychopathology. The minimum sample size required for regression analyses was participants, given a p-value < .05, 9 predictors, .90 as desired statistical power, and 0.15 (medium) as anticipated effect size. There were observed complete data in SCL-90-R and FIQ, and fi ve and one missing data (at random) in MPQ-SF and PSQI, respectively. Considering the low rate of missing observations, and that the collected sample size (n = 181) far exceeds the minimum required, and in order to preserve the genuineness of the data, no imputation method was applied. Results Sociodemographic and Clinical Characteristics FM group had a mean age of 48.79 years (SD = 8.09), and 82.3% were married, 7.2% divorced/separated, 6.6% single and 3.9% widowed. A total of 22.1% of the patients had elementary education, 28.7% secondary education, 16% vocational training and 25.4% university education. Within the sample, 41.1% was employed but more than 57% was not working (23.3% unemployed, 22.8% on sick leave and 11.1% retired). The mean time from FM diagnosis was 6.32 years (SD = 5.13). Most of the patients (87.84%) were receiving pharmacological treatment, mainly anti-depressants, anxiolytics, analgesics, and anti-infl ammatory drugs. As expected, the mean score of the participants in pain intensity (MPQ-SF) was moderately high (M = 7.63; SD = 1.56), in poor sleep quality (PSQI) (M = 14.26; SD = 4.26) exceeded the score (> 5) corresponding to “bad sleepers” (Buysse et al., 1989), and in impairment (FIQ) (M = 62.15; SD = 14.20) exceeded the score (≥ 59) indicative of severe impact (Bennett et al., 2009). Considering the standardized norms of non-clinical population (women, n = 278), T-score ≥ 60 (85th percentile) was taken as the diagnostic cutoff point in psychopathology (SCL-90-R) (González de Rivera et al., 2002). The FM group showed T-scores above the cutoff point in all scales (between T-score = 60 in hostility and T-score = 75 in somatization) and general indexes (T-score =
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