. Author manuscript; available in PMC: 2012 Aug 15.

Published in final edited form as: J Child Psychol Psychiatry. 2010 Oct 6;52(7):792–799. doi: 10.1111/j.1469-7610.2010.02331.x

Table 1.

Rates of observed positive affect (PA) and negative affect (NA) by age in at-risk and control offspring

	Offspring’s age in years

Affect display	< 1 M (SD)	1 M (SD)	2 M (SD)	3 M (SD)	4 M (SD)	5 M (SD)	6 M (SD)	7 M (SD)	8 M (SD)	9 M (SD)
At-risk offspring
PA	.10 (.07)	.09 (.08)	.10 (.09)	.24 (.14)	.19 (.12)	.19 (.10)	.22 (.08)	.20 (.09)	.22 (.13)	.21 (.13)
NA	.06 (.08)	.10 (.13)	.15 (.18)	.08 (.08)	.03 (.04)	.03 (.04)	.04 (.05)	.03 (.04)	.04 (.04)	.04 (.04)
n	9	27	39	55	41	44	30	33	19	8
Control offspring
PA	.08 (.03)	.15 (.16)	.18 (.09)	.24 (.12)	.21 (.12)	.22 (.10)	.23 (.12)	.26 (.14)	.28 (.13)	.21 (.13)
NA	.04 (.01)	.11 (.13)	.10 (.11)	.04 (.04)	.03 (.04)	.03 (.04)	.03 (.05)	.03 (.05)	.02 (.03)	.04 (.04)
n	3	19	32	50	45	44	37	33	19	9

Note: There were 684 observations from 237 children from 162 families. Mean age during infancy was 11.56 months (SD = 5.37 months). At-risk = maternal history of depressive disorder; control = no maternal history of major psychiatric disorder.