Validating and extending the three process model of alertness in airline operations.

The brake was further evaluated in more complex models comparing models without the brake (models 3–4, table 2 ) to models with the brake (models 5–6, table 2 ) suggesting increased fit and a highly significant deviance in favor of the “brake” function comparing the best fitted models (6d & 4d) (chi2 = 67, df≈2, p<.001).

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