47 Income inequalities beyond access to mental health care Table A2. Selection of the study population 2011 2012 2013 2014 2015 2016 2011-2016 Motivation Unique records of adults (>18) living in the Netherlands for at least one (continuous) month in the study period 806,418 641,813 669,557 518,762 515,842 478,203 3,630,595 % excluded (denominator from previous row) Age group of interest living in the Netherlands for the minimum amount of time to allow opening and proceeding with the treatment pathway Records of patients without specialist mental health care expenditure in the previous calendar year (based on health insurance claims data) 458,324 287,264 320,565 223,944 249,635 235,114 1,774,846 51.1% Patients who are at the beginning of the treatment pathway First treatment records in our population 395,377 224,303 223,508 142,634 147,151 128,297 1,261,270 28.9% Non-zero provision of treatment (exclusion of 0 treatment minutes or 0 treatment days) 389,553 220,539 219,730 140,109 144,310 121,226 1,235,467 2.0% Records opened for administrative purposes only No missing data on treatment minutes 338,422 186,530 177,748 109,950 107,423 56,219 976,292 21.0% Missing data on key study variables. Majority of the records with missing data correspond to records closed after intake/ diagnosis or a being opened for a crisis episode, in which regular treatment was not provided.** No missing data on GAF assessment or GAF assessed as 0 (which corresponds to insufficient information to evaluate it) 333,332 184,664 177,688 109,856 106,914 53,597 966,051 1.0% No missing data on income (final population) 328,782 181,559 175,135 108,123 105,250 52,681 951,530 1.5% From the records with missing data, number of records that were closed after intake/diagnosis/crisis 41,973 29,199 41,893 29,824 32,933 31,259 207,081 72.9%* Notes: *The denominator for this proportion is given by the sum of the observations excluded due to missing data (1,235,467-951,530=283,937). **Results excluding records closed after intake/diagnosis/crisis lead to the same conclusions and are available at request. GAF – Global Assessment of Functioning score 2
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