Table 3.

Activity, social adaptability, reactivity, endurance, concentration, and motor coordination were extracted for the IBR at 24 months of age.

IBR Items		Factors
No.	Name	I	II	III	IV	V	VI
20	Manipulating	0.83
4	Cooperativeness	0.73
24	Sucking toys	0.73
21	Body motion	0.59
25	Energy	0.56
16	Sight	0.56
17	Listening		0.75
2	Social with examiner		0.72
19	Banging		0.72
5	Fearfulness		−0.56
18	Vocalizing		0.54
3	Social with mother		0.41
27	Fine muscle			0.75
1	Social with persons			0.61
15	Reactivity			0.44
7	Emotional tone				0.64
6	Tension				−0.57
13	Endurance				0.53
11	Goal directedness					0.68
14	Activity					−0.56
23	Sucking pacifier					0.43
12	Attention span					0.41
26	Gross muscle						−0.65
22	Sucking thumb or fingers						−0.64
8	Object orientation						0.45
Percentage of total variance		15.73	12.21	7.31	7.17	6.59	6.45

IBR, infant behavior record. Factor I: activity; Factor II: social adaptability; Factor III: reactivity; Factor IV: endurance; Factor V: concentration; Factor VI: motor coordination.