Table 2.

Mean difference at each time point in number of sucks measured by the 7 mm Hg vs 20 mm Hg pressure threshold, by postmenstrual age (PMA) at baseline feeding.

PMA at baseline (weeks)	Feeding observation number	Difference in number of sucks (7 mm Hg–20 mm Hg threshold)
		n	Mean	SD	Min	Max
32	1	14	46.9	37.8	6.0	135.0
	2	12	47.4	25.2	8.0	95.0
	3	12	37.5	19.3	14.0	69.8
	4	6	31.3	12.2	11.0	46.0
33	1	25	39.1	31.8	10.0	141.2
	2	24	42.6	31.5	16.0	149.9
	3	17	29.7	17.2	3.0	59.0
	4	5	43.2	36.8	8.9	96.0
34	1	42	41.5	40.3	7.0	247.8
	2	44	38.0	30.1	6.9	173.0
	3	24	32.6	25.2	7.0	120.6
	4	4	36.1	19.3	15.5	57.8
35–36	1	50	29.6	20.7	3.0	91.0
	2	34	32.5	19.5	4.0	92.2
	3	15	49.5	43.5	6.0	148.0
	4	3	28.1	22.2	11.0	53.1