Notes: We report the first-stage results of a linear probability model stratified by age group. The binary outcome of interest is the initial assessment of an inmate’s mental health needs being either none/low or moderate/severe. The propensity to assign the most severe score is estimated using data from other cases assigned to the clinician following the procedure described in the text. Columns 1 and 2 limit the sample to transition age youth, whereas Columns 3 and 4 limit the sample to adults. Columns 1 and 3 show the results by controlling only for month–year fixed effects, whereas Columns 2 and 4 also include the inmate baseline controls as shown in Table 1. Each column gives the corresponding clinician and inmate robust two-way clustered standard errors in parentheses. Robust (Kleibergen–Paap) first-stage F-statistic is reported. Note this is equivalent to the effective F-statistic of Montiel Olea and Pflueger (2013) in this case of a single instrument. ^*p < 0.10, ^**p < 0.05, ^***p < 0.01.