. 2009 Mar;80(2):593–605. doi: 10.1111/j.1467-8624.2009.01281.x

Table 2.

Measures From 4-Year and 6-Year Assessments, With Reliabilities^a

Domain	Four-year measure	Six-year measure
Nonverbal ability	Composite of Block Building, Puzzle Solving, Tapping Sequence, and Draw a Design from McCarthy Scales of Children’s Abilities (MSCA; McCarthy, 1972); [r_i = .89]	Block Design from the Wechsler Abbreviated Scale of Intelligence (WASI; Wechsler, 1999); r_i = .85
Vocabulary	MCSA Word Knowledge; [r_i = .89]	WASI Vocabulary; r_i = .87
Sentence comprehension	Verbal Comprehension subtest, British Ability Scales (Elliott et al., 1996); r^a = .77	Sentence Structure subtest of the CELF-R; r_i = .52
Verbal memory	MCSA Verbal Memory for Words and Sentences; [r_i = .74]	Recalling Sentences from CELF–R (Semel et al., 1987); r_i = .91
Phonological awareness	Experimental test from Bird, Bishop, and Freeman (1995), 12-item version; r^a = .76	Experimental test from Bird, Bishop, and Freeman (1995), 18-item version; r^a = .91
Oromotor skills	Goldman-Fristoe Sounds in Words (Goldman & Fristoe, 1986); r^a = .96
Nonword repetition	Children’s Test of Nonword Repetition (Gathercole, Willis, Baddeley, & Emslie, 1994) (20-item version); r^a = .88	Children’s Test of Nonword Repetition (Gathercole et al., 1994) (full 40-item version); r^a = .88

r_a = coefficient alpha from Twins Early Development Study sample; r_i = internal consistency from test manual; square brackets denote best estimate from similar composite in test manual.