Table 2. Estimated Duration of Different Phases of the Anesthetic

* Average (± standard error of the mean) across all four observations (OB1-OR, OB1-V1, OB2-V1, OB2-V2).

† Average difference (± standard error of the mean) of one observer's estimates of the duration of each phase of 19 cases on two independent observations from video (OB2-V1 *vs.* OB2-V2).

‡ Average difference (± standard error of the mean) of a different observer's estimates of the duration of the phases of 20 cases comparing one observation in real time (OR) and one observation from video (OB1-OR *vs.* OB1-V1).

§ Average difference (± standard error of the mean) in the two observers’ independent estimates of duration of each phase of 19 cases, each based on one observation from video (OB1-V1 *vs.* OB2-V2).

∥ Significant difference between observers (*P* < 0.05) for estimates of the duration of this phase of the case.

OR = operating room.