142 Chapter 5 months (SD = 5.9) at 18-month follow-up. Participants in the TAU group received TAU for an average of 10.2 months (SD = 3.1) at 12-month follow-up and 13.4 months (SD = 5.5) at 18-month follow-up. On average, patient-coach dyads were matched 7.3 months (SD = 3.6) from baseline to 12-month follow-up and 9.0 months (SD = 4.8) from baseline to 18-month follow-up. Furthermore, the percentage of participants with missingness on two or more follow-up assessments (i.e., missingness at 3-, 6-, 9-, 12-, and/or 18-months) was not significantly different between treatment groups. In the TAU+FNC group 78% of the participants (n = 40) completed two or more follow-up assessments, compared to 74% in the TAU group (n = 38). In addition, comparison of demographic and clinical baseline characteristics of participants with two or more missing data points and participants with less than two missing data points showed that missingness was associated with sex; 53% of female participants (n = 7) and 18.9% of the males (n = 17) missed two or more data points (p = 0.006) and education; 36.1% of participants with senior secondary and higher education (n = 13), 19.4% of participants with preparatory secondary education (n = 7), and 10.7% of participants with primary education or no qualifications (n = 3) missed two or more data points (p = 0.046).
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