Table 1.

Infants’ Behavior	Definition	Kappa (6 months)	Kappa (12 months)
Negative Behavior*	Crying, fussing, whining, or negative affect	0.91	0.86
Force Out*	Physically removing food from mouth	N/A	0.81
Refusal*	Swatting spoon, back arching, mouth pursed shut, turning away	0.87	0.83
Positive Behavior	Smiling, reaching toward the spoon, leaning forward, or opening mouth in anticipation of the next bite	0.89	0.89
Gagging	Gagging	0.95	0.94
Distaste	Nose wrinkling, lip raises, or shuttering/shivering	0.88	0.88
Neutral Response	A neutral bite in response to the food	0.89	0.85

Note. Kappa is a measure of inter-rater drift reliability that takes into account the agreement that may occur by chance between raters. Codes marked with an * were included in the rejection proportion scores. N/A is listed for codes that did not occur during drift reliability files.