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. Author manuscript; available in PMC: 2013 Jan 14.
Published in final edited form as: Infancy. 2007 Jan 1;11(1):1–30. doi: 10.1207/s15327078in1101_1

TABLE 1.

Selected Means, Standard Deviations, and Sample Sizes by Condition and Age Group in Both Experiments

Experiment 1 Experiment 2
15 Montha 18 Montha 24 Montha 18 Monthb
Variable M SD M SD M SD M SD
Mother comfort   3.70 0.89   4.14 0.81   4.31 0.86 4.65 1.09
Child experience   3.67 2.09   5.00 2.06   5.56 1.34 3.94 1.09
Pretend Real Pretend Real Pretend Real Pretend Real
n smiley at baseline    5   1     3   3   15 10   6   6
% smile after own act
    M   31 27   46 13   29 08 18 14
    SD   21 21       .22 19   27 13 20 21
Duration hand at mouth:
Eat (secs)
    M       .56     .34       .47     .35       .42     .36     NA     NA
    SD       .25     .15       .24     .12       .24     .16
Maximum pour angle
    M 128 88 118.7 77.5 113.9 92.7     NA     NA
    SD   18.0   9.4   20.1 13.6   16.2   9.3
SD of pitch
    M   58.1 53.8   57.1 59.3   54.4 51.8 53.62 53.74
    SD     9.3 10.5   12.4 10.6     9.5 11.0   3.9   5.1
a

n = 18.

b

n = 37.