Table 4.
Study 2 Descriptives for Each Year Group Network
| Year 9 Midadolescence | Year 10 Later midadolescence | Year 11A Late adolescence | Year 11B Late adolescence | Group comparison | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M (SD) | Range | N | M (SD) | Range | N | M (SD) | Range | N | M (SD) | Range | N | F(df), p or , p | |
| Age (years) | 14.10 (0.36) | 13.5 to 14.5 | 13 | 15.10 (0.38) | 14.5 to 16.1 | 24 | 15.96 (0.24) | 15.5 to 16.4 | 25 | 16.00 (0.28) | 15.6 to 16.4 | 19 | |
| Kiddie Mach | 56.35 (5.08) | 50 to 68 | 13 | 57.94 (10.82) | 42 to 79 | 16 | 57.16 (7.61) | 44 to 74 | 25 | 56.67 (6.42) | 45 to 67 | 19 | F(3, 70) = .12, p = .949 |
| IRI PT | 21.61 (3.87) | 12 to 26 | 13 | 22.37 (5.99) | 11 to 31 | 22 | 22.80 (4.43) | 10 to 29 | 25 | 22.82 (5.72) | 14 to 35 | 19 | F(3, 78) = .19, p = .905 |
| IRI EC | 25.50 (3.82) | 18 to 30 | 13 | 25.20 (5.56) | 11 to 33 | 22 | 25.00 (4.82) | 14 to 31 | 25 | 24.95 (3.75) | 16 to 31 | 19 | F(3, 78) = .04, p = .987 |
| FASII | 6.54 (2.37) | 2 to 9 | 13 | 5.87 (2.01) | 0 to 9 | 22 | 6.80 (1.56) | 4 to 9 | 25 | 7.00 (1.50) | 4 to 9 | 18 | F(3, 78) = 1.57, p = .203 |
| Duration 2 | 2.50 (0.00) | 2.50 to 2.50 | 13 | 3.25 (0.74) | 0.5 to 3.5 | 24 | 4.46 (0.20) | 3.5 to 4.5 | 25 | 4.34 (0.69) | 1.5 to 4.5 | 19 | F(3, 80) = 53.20, p < .001 |
| Best friends | 0.91 (0.70) | 0 to 2 | 12 | 0.96 (0.93) | 0 to 3 | 23 | 0.80 (0.96) | 0 to 3 | 25 | 1.00 (1.05) | 0 to 3 | 19 | χ2(9) = 22.64, p = .007 |
| mDG: Points to self | 20.29 (18.98) | 0 to 58.82 | 13 | 33.08 (32.33) | 0 to 100 | 24 | 36.79 (30.24) | 0 to 90 | 25 | 31.29 (27.53) | 0 to 100 | 19 | F(3, 80) = .96, p = .415 |
|
Density M (SEM) |
Range | N |
Density M (SEM) |
Range | N |
Density M (SEM) |
Range | N |
Density M (SEM) |
Range | N | t‐test group difference a | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mDG: Points to others | 6.64 (.42) | 0 to 30 | 156 | 2.78 (.24) | 0 to 50 | 552 | 2.63 (.28) | 0 to 60 | 600 | 3.82 (.46) | 0 to 100 | 342 | Year 9 versus all other groups |
| Relationship strength | 0.22 (.03) | −.25 to 1 | 156 | 0.15 (.01) | −.33 to 1 | 552 | 0.10 (.01) | −.33 to 1 | 600 | 0.24 (.02) | −.33 to 1 | 342 | Year 9 versus Year 11A and Year 11B |
| Relationship reciprocation | 0.21 (.01) | −.81 to .81 | 156 | 0.15 (.01) | −.67 to .67 | 552 | 0.14 (.01) | −.78 to .78 | 600 | 0.16 (.01) | −.63 to .63 | 342 | Year 9 versus Year 10 and Year 11A |
| Duration 1 | 0.12 (.03) | 0 to 1 | 156 | 0.15 (.02) | 0 to 1 | 552 | 0.10 (.01) | 0 to 1 | 600 | 0.06 (.01) | 0 to 1 | 342 | Year 10 versus Year 11B |
The upper half of the table shows nonnetwork descriptives while the lower half of the table shows descriptives for network data. Network data were compared across groups using t tests based on bootstrapped mean density and standard error, with degrees of freedom based on N observations across groups. IRI PT/EC = interpersonal reactivity index PT/EC subscales; FASII = Family Affluence Scale; Duration 2 = for how many years the participant had attended the current school; Best friends = number of self‐nominated best friends in the current network; mDG = modified Dictator Game; Duration 1 = whether the participant had known his or her classmate since primary (= 1) or secondary (= 0) school.
aFor comparison of network data across groups, analyses of variance is not permitted since there is no accepted method for computing whole sample and individual network variance based on nonindependent observations. Therefore, we used the bootstrapping method (see Methods in Study 1) to conduct t tests comparing network data between all pairs of networks, with Bonferroni correction for multiple comparisons (statistical significance = .05/6, i.e., p < .0008 two‐tailed). For t and p values, see Appendix S1.