Table 1.

Characteristics of birth cohort – participation in 21-year follow-up (main youth questionnaire).

Characteristic	N (of 7214)	Completed questionnaire (%)		Maltreatment notification (%)
Maltreatment notification			x2,p		x2,p
No notifications	6425	54.4	92.3, <0.001	0	N/A
Any notification	789	36.2		100.0
Gender
Male	3745	47.8	65.3, <0.001	10.1	5.3, 0.021
Female	3469	57.3		11.8
Race
White	6250	54.3	91.4, <0.001	10.7	23.5, <0.001
Aboriginal-Islander	444	32.0		17.6
Asian	307	44.3		7.8
Maternal age at birth of child
13–19	993	41.1	59.4, <0.001	20.5
20–34	5865	54.0		9.6	113.1, <0.001
35+	356	56.2		6.2
Relationship status at birth of child
Not in relationship	991	39.3	79.2, <0.001	20.9	116.8, <0.001
Living together	6223	54.5		9.4
Family income (annual) prior to birth
<=$10399	2304	46.0	71.3, <0.001	16.1	106.8, <0.001
>$10400	4436	56.8		7.9
Maternal education status in pregnancy
Incomplete high school	1304	45.9	49.4, <0.001	19.1
Completed high school	4601	52.2		10.0	132.8, <0.001
Post high school	1256	59.8		5.4