Table 4.

Comparison of program retention by MPPTI site, 2014–2017

Site pair	Difference between means in months	95% confidence limits	Significant at 0.05 level
Chelsea–Lawrence	2.2	− 2.5, 6.8
Chelsea–New Bedford	6.5	1.2, 11.8	*
Chelsea–Holyoke	7.1	2.1, 12.1	*
Chelsea–Springfield	9.6	4.9, 14.4	*
Holyoke–Chelsea	− 7.1	− 12.1, − 2.1	*
Holyoke–Lawrence	− 4.9	− 9.5, − 0.3	*
Holyoke–New Bedford	− 0.5	− 5.8, 4.7
Holyoke–Springfield	2.6	− 2.2, 7.3
Lawrence–Chelsea	− 2.2	− 6.8, 14.4
Lawrence–New Bedford	4.4	− 0.5, 9.3
Lawrence–Holyoke	4.9	0.3, 9.5	*
Lawrence–Springfield	7.5	3.1, 11.8	*
New Bedford–Chelsea	− 6.5	− 11.9, − 1.2	*
New Bedford–Lawrence	− 4.4	− 9.2, 0.5
New Bedford–Holyoke	0.5	− 4.7, 5.8
New Bedford–Springfield	3.1	− 2.0, 8.2
Springfield–Chelsea	− 9.6	− 14.4, − 4.6	*
Springfield–Lawrence	− 7.5	− 11.8, − 3.1	*
Springfield–New Bedford	− 3.1	− 8.2, 2.0
Springfield–Holyoke	− 2.6	− 2.6, − 7.3

Notes. Pairwise comparisons made using Scheffe’s test. MPPTI Massachusetts Pregnant and Parenting Teen Initiative