96 Chapter 3 APPENDIX F. TRENDS IN MENTAL HEALTH CARE USE BY AGE IN MONTHS AND BY YEAR Figure A4. Trends in mental health care use by age in months for each study year and 2012 Notes: Each dot corresponds to a cohort of individuals born in January, February, March, etc. and represents the average of mental health care use (binary indicator) for that cohort, estimated from the raw data. The figure is obtained from the population born between 1988 and 1999, observed for the years of the 15th to 21st birthday (2,862,771 female and 2,973,588 male individuals). Depending on their birth cohort individuals might be represented in 1 to 6 of the dots (Appendix C). Quadratic age polynomials are used for female and linear age-trends for male. Only observations 204-216 and 228-239 (grey shaded areas) are used in the main analysis, except the year of 2012.
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