A case-control study requires official permission and years of delayed answers.

Evidence

That December the Centers for Disease Control formally requested permission from the city to launch an investigation into the possible leukemia cluster. With help from the Massachusetts Department of Health, an epidemiologist from Atlanta began designing a study for Woburn. Trained researchers from the department of health would be sent to the homes of the twelve families with leukemic children and conduct in-depth interviews on a wide range of subjects. The researchers would also interview twenty-four other Woburn families that had been selected as controls, matched by age and sex with the leukemic families. The study, said the experts, would take a year to complete. — , Harr Jonathan - A Civil Action, 166

Categorization

• DEFINE: Textbook case-control design: twelve exposed families against twenty-four age- and sex-matched controls — the mechanics of an epidemiological cluster study in miniature.
• SHARE: The hometown-cluster-investigation detail — a dozen families, twenty-four controls, a year of waiting — is exactly the kind of specific procedural nugget only a true-crime/epidemiology obsessive would savor.
• XREF: connects to: A correct scientific finding can arrive too late to matter legally. — , Harr Jonathan - A Civil Action , 2066; Institutional resistance delayed publication of a correct clinical observation by thirteen years. — , The Rod and the Child: A Global History…, 9524; Demanding more research can delay regulation despite abundant evidence (+1 more)

Broader Connections

• Institutional resistance delayed publication of a correct clinical observation by thirteen years. #complicates (0.95) — , The Rod and the Child, 9524
• Demanding more research can delay regulation despite abundant evidence #complicates (0.85)
• Sustained investigation can harden rather than erode an advocate’s belief in their case #qualifies (0.80) — , Harr Jonathan - A Civil Action, 1446