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# Long description

A map showing the geographical distribution of schizophrenia rates across Chicago neighbourhoods between 1922 and 1931. It maps the rate of schizophrenia cases per 100,000 adult population based on 1927 population estimates.

The map displays Chicago divided into various neighbourhood sectors. The map uses five distinct patterns to indicate the rate of incidents:

- under 250 (lowest rate)
- 250–399
- 400–549
- 550–699
- 700–over (highest rate)

The highest rates (700–over and 550–699) are clustered in a small, concentrated area directly in the centre-east of the city, along the Lake Michigan shoreline (near the Loop and Madison Street).

As you move outward from this central core toward the northern, southern, and western outskirts, the rates consistently drop. The outermost suburbs and edges of the city are dominated by the under 250 and 250–399 patterns. High concentrations (400–549 and above) also extend slightly westward along major corridors like Chicago Avenue and Roosevelt Road, but remain largely centralised.