Table 5

Model fitting results of the means model on triplet BW

step

Model

Nparameters

-2LL

df

to model

Χ2

Δ df

p


1

Full model

25

576.10

1194


2

a. Equal mean MZ pairs within MZ and DZ trios

22

577.11

1197

1

1.01

3

0.80

b. Equal var MZ pairs within MZ and DZ trios

21

579.62

1198

2a

2.51

1

0.11

c. Equal cov MZ pairs within MZ and DZ trios

20

581.32

1199

2b

1.70

1

0.19


3

a. Equal mean DZ/TZ

17

597.89

1202

2c

16.57

3

'0.00

b. Equal var DZ/TZ

19

584.16

1200

2c

2.84

1

0.09

c. Equal cov DZ/TZ

18

585.71

1201

3b

1.01

2

0.31


4

a. Equal mean within MZ

16

591.32

1203

3c

5.61

2

0.06

b. Equal mean within DZ

14

592.24

1205

4a

0.92

2

0.63

c. Equal mean within TZ

12

621.31

1207

4b

29.07

2

0.00


5

a. Effect GA2 = 0

13

594.73

1206

4b

2.49

1

0.11

b. Effect GA = 0

12

1013.26

1207

5a

418.53

1

0.00

c. Effect sex = 0

12

631.42

1207

5a

36.69

1

0.00

d. Effect alcohol = 0

12

594.84

1207

5a

0.11

1

0.74

e. Effect smoking = 0

11

605.74

1208

5d

10.9

1

0.00


MZ = monozygotic; DZ = dizygotic; TZ = trizygotic; GA = gestational age. The best fitting model is printed in bold font.

Lamb et al. BMC Pediatrics 2011 11:24   doi:10.1186/1471-2431-11-24

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