Inter-rater reliability for classification of feeding categories by the two RAs indicated excellent agreement (see Table 3).
The intraclass correlation coefficient (ICC) measuring agreement between the two RAs ranged from 0.90 (95% CI 0.826 to 0.941) to 1.00 (95% CI 0.996 to 0.999) across the various time points.
Agreement between the RAs feeding category at 1 month and mothers’ diaries at four weeks was measured as 0.80 (95% CI 0.662, 0.884; see Table 4). An ICC above 0.75 is considered excellent [11].