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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: Child Dev. 2017 May 24;89(5):1519–1534. doi: 10.1111/cdev.12843

Table 4.

Model Fit Statistics, Estimated Intercepts, and Slopes

Fearfulness Observed Fear: Lab-TAB Masks
N = 137		 Mother-Reported Fear IBQ-R
N = 147
Model Linear (df = 5) Quadratic (df = 1) Piecewise (df = 0) Linear (df = 5) Quadratic (df = 1) Piecewise (df = 0)
χ2 23.09 (p = .00) 0.11 (p = .74) 0.00 (p = 1.00) 2.79 (p = .73) 0.21 (p = .88) 0.00 (p = 1.00)
RMSEA 0.17 0.00 0.00 0.00 0.00 0.00
SRMR 0.14 0.01 0.00 0.04 0.00 0.00
AIC 960.48 945.01 946.91 892.49 897.52 899.50
BIC 986.22 982.18 986.94 917.94 934.29 939.09
Inter-cept/Level1 −0.02 −0.03 −0.02 2.28** 2.01** 2.27**
Intercept/Level Variance 0.29** −0.05 0.64** 0.36** 1.06 0.56**
Estimated Slope 0.01 0.01 ------ 0.24** 0.28** ------
Slope Variance 0.01 0.12 ------ 0.05* 0.71 ------
Quadratic Slope ----- 0.00 ------ ------ -0.01 ------
Quadratic Slope Variance ----- 0.06 ----- ----- 0.03 ------
Trend 1 Slope ------ ------ 0.00 ------ ------ 0.25**
Trend 2 Slope ------ ------ 0.03 ------ ------ 0.25**
Trend 3 Slope ------ ------ 0.12 ------ ------ 0.22**
Trend 1 Variance ------ ------ 0.55** ------ ------ 0.67**
Trend 2 Variance ------ ------ 1.42** ------ ------ 0.55**
Trend 3 Variance ------ ------ 0.85** ------ ------ 0.43**
Positive Affectivity Observed Positive Affectivity: Lab-TAB Peek-a-boo
N = 147		 Mother-Reported Smiling/Laughter IBQ-R
N = 148
Model Linear (df = 5) Quadratic (df = 1) Piecewise (df = 0) Linear (df = 5) Quadratic (df = 1) Piecewise (df = 0)
χ2 4.29 (p = .51) 0.03 (p = .87) 0.00 (p = .00) 4.45 (p = .92) 1.33 (p = .97) 0.00 (p = .00)
RMSEA 0.00 0.00 0.00 0.00 0.00 0.00
SRMR 0.06 0.00 0.00 0.03 0.02 0.00
AIC 350.82 355.99 355.96 1162.76 1167.50 1178.04
BIC 376.49 391.07 395.89 1192.38 1208.98 1237.30
Inter-cept/Level1 0.61** 0.62** 0.62** 4.50** 4.51** 4.50**
Intercept/Level Variance 0.09** 0.14** 0.15** 0.84** 0.85** 1.15**
Estimated Slope 0.06** 0.03 ------ 0.04# 0.01 ------
Slope Variance 0.01* 0.11 ------ 0.03** 0.08 ------
Quadratic Slope ------ 0.01 ------ ------ 0.01 ------
Quadratic Slope Variance ------ 0.01 ------ ------ 0.01 ------
Trend 1 Slope ------ ------ 0.04 ------ ------ 0.07
Trend 2 Slope ------ ------ 0.07 ------ ------ -0.03
Trend 3 Slope ------ ------ 0.07 ------ ------ 0.06
Trend 1 Variance ------ ------ 0.15** ------ ------ 0.58**
Trend 2 Variance ------ ------ 0.15** ------ ------ 0.46**
Trend 3 Variance ------ ------ 0.19** ------ ------ 0.51**
*

p < .05;

**

p < .01;

#

p < .10.

1

Level corresponds to intercept in the piecewise model.

Notes. Best model fit: fear = piecewise; positive affectivity = linear; Trend 1= 6–8 months; Trend 2 = 8–10 months; Trend 3 = 10–12 months.

RMSEA = root-mean-square error of approximation; SRMR = standardized root-mean-square residual; AIC = Akaike Information Criterion; BIC = Bayesian Information Criterion.