Table 2.

Main Characteristics of Participants According to the Number of TAT Copies in the E-Risk and Dunedin Studies

	No. (%) of Participants
Characteristic	0 TAT Copies (n=356)	1 TAT Copy (n=458)	2 TAT Copies (n=185)	Statistic; P Value
	E-Risk Study (n=999)
Women	356 (100)	458 (100)	185 (100)	…^a
Age, y, mean (SD)	39.6 (5.9)	40.1 (5.9)	40.3 (5.7)	F₂=1.05; .34
Socioeconomic status				$χ_{2}^{4} = 7.61$ ; .10
Low	125 (35.1)	154 (33.6)	48 (25.9)
Intermediate	123 (34.6)	140 (30.6)	68 (36.8)
High	108 (30.3)	164 (35.8)	69 (37.3)
Exposure to severe maltreatment in childhood	36 (10.1)	30 (6.6)	10 (5.4)	$χ_{2}^{2} = 5.18$ ; .07
Diagnosis of past-year MDD	58 (16.3)	57 (12.4)	24 (13.0)	$χ_{2}^{2} = 2.64$ ; .26
Diagnosis of recurrent MDD^b	47 (13.2)	60 (13.0)	20 (10.8)	$χ_{2}^{2} = 0.73$ ; .69

	No. (%) of Participants
Characteristic	0 TAT Copies (n=292)	1 TAT Copy (n=448)	2 TAT Copies (n=159)	Statistic; P Value

	Dunedin Study (n=899)
Women	156 (53.4)	217 (48.4)	69 (43.4)	$χ_{2}^{2} = 4.33$ ; .11
Age, y, mean	32	32	32	…^c
Socioeconomic status				$χ_{2}^{4} = 0.79$ ; .93
Low	90 (30.8)	141 (31.5)	49 (31)
Intermediate	155 (53.1)	228 (50.9)	79 (50)
High	47 (16.1)	79 (17.6)	30 (19)
Exposure to severe maltreatment in childhood	28 (9.6)	35 (7.8)	14 (8.8)	$χ_{2}^{2} = 0.72$ ; .69
Diagnosis of past-year MDD	53 (18.2)	70 (15.6)	25 (15.7)	$χ_{2}^{2} = 0.89$ ; .63
Diagnosis of recurrent MDD^b	54 (18.1)	70 (15.4)	31 (19.0)	$χ_{2}^{2} = 1.58$ ; .45

Abbreviation: MDD, major depressive disorder.

Because the entire sample was composed of women, we did not compare the 3 groups on the distribution of sex.

Individuals included in a minimum of 2 assessment periods were evaluated for recurrent MDD and included in the analysis for this outcome. E-Risk Study, n=1000; Dunedin Study, n=918.

Because the entire sample was composed of individuals of the same age, we did not compare the 3 groups on the mean age.