highly significantp = 1.433 × 10 − 11
Not surprisingly, a Wald test indicates that the odds of a contact event detected by a card being reciprocated is estimated to be 4.748 (3.022, 7.462) times higher than that of a contact event reported in case investigations, a highly significant difference ( z = 6.755, p = 1.433 × 10 − 11 ).