Human task-time evidence

Historical experiments in specific professional cohorts. In the normalized column, negative values mean less time with AI; positive values mean more time. A preparation-time ratio of 1 means no difference. These results do not measure lost paid hours, represent a whole country or forecast 2030/2035.

Primary, secondary and sensitivity analyses remain separate. In normalized units, intervals crossing zero permit effects in both directions. An unextracted interval is explicitly missing.

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