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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: J Educ Psychol. 2014 Jul 7;107(1):79–95. doi: 10.1037/a0037210

Table 1.

Means (Standard Deviations) of writing measures

Grade 3 Grade 2

Entire Sample Males Females Entire Sample Males Females Loadings
WIAT total raw score
(Words written +
theme and
organization )
88.82 (35.23) 81.90 (32.90) 97.55 (36.25) 79.89 (36.09) 71.35 (36.35) 87.21 (34.35) NA
WIAT total score: SS 107.92 (13.74) 105.73 (14.06) 110.68 (12.87) NA NA NA NA
WIAT theme &
organization raw
6.58 (2.84) 6.28 (2.90) 6.97 (2.74) 5.62 (2.59) 5.38 (2.65) 5.83 (2.53) .72
WIAT theme &
organization SS
105.09 (16.02) 103.71 (16.53) 106.83 (15.24) NA NA NA NA
WJ-III Writing Fluency
raw
13.62 (4.41) 12.89 (4.11) 14.55 (4.62) 10.11 (4.97) 9.48 (4.92) 10.68 (4.96) .67
WJ-III Writing Fluency
SS
98.24 (15.78) 96.34 (13.85) 100.63 (17.69) 95.09 (26.54) 93.44 (24.29) 96.57 (28.44) NA
Writing Quality Indicators
WIAT Idea quality 3.89 (0.88) 3.81 (0.83) 3.98 (0.93) 3.44 (0.76) 3.32 (0.81) 3.55 (0.71) .66
WIAT Organization 3.25 (0.89) 3.21 (0.86) 3.30 (0.94) 2.88 (0.82) 2.79 (0.86) 2.96 (0.79) .70
Narrative Idea quality 4.46 (1.00) 4.30 (0.92) 4.66 (1.06) 4.10 (1.10) 3.99 (1.17) 4.19 (1.04) .65
Narrative
Organization
3.56 (0.87) 3.44 (0.76) 3.71 (0.97) 3.16 (0.78) 3.10 (0.84) 3.21 (0.73) .63
Pet Idea quality 3.76 (0.80) 3.66 (0.76) 3.88 (0.83) 3.55 (0.81) 3.39 (0.80) 3.70 (0.80) .54
Pet Organization 2.96 (0.69) 2.92 (0.71) 3.02 (0.67) 2.66 (0.69) 2.53 (0.65) 2.77 (0.69) .60
CBM scores
WIAT CWS 63.53 (31.85) 57.40 (30.30) 71.19 (32.27) 52.93 (29.97) 45.40 (28.15) 59.23 (20.11) NA
WIAT IWS 26.43 (16.10) 25.47 (14.16) 27.71 (18.22) 29.55 (20.52) 27.94 (22.24) 30.91 (18.93) NA
Narrative CWS 66.35 (35.35) 59.94 (31.00) 74.63 (38.89) 54.68 (28.01) 48.50 (25.65) 30.91 (18.93) NA
Narrative IWS 32.36 (18.33) 31.63 (17.25) 33.30 (19.68) 37.19 (23.50) 34.82 (25.38) 39.16 (21.73) NA
Pet CWS 62.87 (34.33) 54.31 (30.10) 73.22 (36.34) 54.10 (33.52) 45.25 (29.47) 61.69 (35.01) NA
Pet IWS 25.57 (17.83) 24.91 (18.32) 26.36 (17.27) 27.40 (21.29) 26.25 (21.29) 28.39 (21.28) NA
WIAT %CWS .76 (.18) .74 (.18) .78 (.18) .69 (.22) .68 (.22) .71 (.22) .87
Narrative %CWS .73 (.17) .72 (.17) .74 (.18) .66 (.20) .66 (.20) .66 (.20) .80
Pet %CWS .78 (.20) .75 (.21) .81 (.19) .72 (.22) .69 (.22) .74 (.22) .78
WIAT CIWS 37.09 (35.02) 31.99 (33.18) 43.48 (36.35) 23.46 (34.10) 17.66 (32.66) 28.32 (34.65) .87
WIAT CIWS SS 100.35 (17.13) 97.96 (16.55) 103.36 (17.44) NA NA NA NA
Narrative CIWS 33.99 (36.83) 28.31 (31.25) 41.33 (42.00) 17.48 (31.69) 13.67 (31.88) 20.64 (31.32) .85
Pet CIWS 37.31 (36.71) 29.40 (31.85) 46.86 (39.94) 26.58 (34.84) 18.74 (29.86) 33.30 (37.43) .79
Writing Productivity Indicators
WIAT number of
words
82.38 (33.66) 75.83 (31.17) 90.58 (34.97) 74.77 (34.99) 66.36 (34.90) 81.88 (33.59) .87
WIAT number of
words SS
109.00 (13.49) 106.51 (13.14) 112.15 (13.33) NA NA NA NA
Narrative number of
words
89.44 (38.38) 82.01 (34.08) 99.03 (41.52) 82.36 (38.12) 73.79 (36.56) 89.47 (38.06) .84
Pet number of words 80.05 (36.92) 72.52 (35.24) 89.14 (37.01) 73.86 (41.14) 64.33 (39.14) 82.11 (41.21) .76
WIAT number of ideas 12.07 (5.04) 11.28 (4.80) 13.06 (5.18) 11.73 (5.51) 10.44 (5.34) 12.82 (5.43) .80
Narrative number of
ideas
15.62 (6.69) 14.30 (6.02) 17.31 (7.14) 14.26 (6.80) 12.76 (6.46) 15.50 (6.84) .78
Pet number of ideas 12.95 (5.84) 11.74 (5.52) 14.41 (5.91) 11.69 (6.01) 10.47 (5.84) 12.76 (5.98) .69

Note. WIAT = Wechsler Individual Achievement Test-Third Edition. SS = standard score. WJ-III = Woodcock Johnson III Tests of Achievement. CBM = curriculum-based measurement. CWS = correct word sequences. IWS = incorrect word sequences.

CIWS = correct minus incorrect word sequences.

Loadings were for the following latent variables: Writing quality, CBM writing, and productivity. The loadings of the WIAT theme and organization, and WJ-III Writing Fluency raw were those when they were considered as indicators of the writing quality.