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. Author manuscript; available in PMC: 2014 Jul 15.

Published in final edited form as: Child Dev. 2010 Jan-Feb;81(1):212–223. doi: 10.1111/j.1467-8624.2009.01390.x

Table 5.

Secure versus Insecure by Placement Age Group

	Percent Secure (SSP)
Age cutoff (months)	Younger	Older	X²(1)	p
18 mos	53.8	46.8		ns
20 mos	58.8	44.2		ns
22 mos	63.6	39.5	3.26	.071
24 mos	69.0	29.0	9.57	.002
26 mos	66.7	25.9	9.87	.002
28 mos	60.0	25.0	6.54	.011

Note. SSP = Strange Situation Procedure