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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Dev Psychol. 2017 Jun 12;53(9):1738–1749. doi: 10.1037/dev0000363

Table 1.

Mean (standard deviation) relationship length and romantic qualities

Wave 1 Wave 2 Wave 3 Wave 4 Wave 5 Wave 6 Wave 7 Wave 8
N participants in a relationship (N = 1055) 108 124 142 141 134 141 136 129
Age (N = 1040) 15.88 (0.47) 16.89 (0.47) 17.95 (0.50) 19.04 (0.56) 20.52 (0.56) 22.12 (0.51) 23.71 (0.60) 25.67 (0.62)
Relationship Length (N = 1055) 4.54 (3.60) 6.99 (5.42) 9.73 (8.11) 12.39 (11.45) 16.00 (14.03) 20.58 (20.01) 27.18 (24.52) 37.54 (32.87)
Support (N = 1050) −0.45 (0.86) −0.29 (0.89) −0.25 (0.85) −0.20 (0.86) −0.15 (0.91) −0.07 (0.92) −0.06 (0.92) −0.01 (0.92)
Negative Interactions (N = 1046) −0.12 (0.80) −0.13 (0.80) 0.10 (1.11) −0.08 (0.90) 0.10 (0.94) 0.05 (0.90) 0.04 (0.78) 0.01 (0.87)
Jealousy (N = 1044) 0.06 (0.85) −0.04 (0.81) 0.15 (0.87) 0.03(0.87) 0.11 (0.92) 0.03 (0.89) −0.08 (0.76) −0.26 (0.92)
Control (N = 930) −0.08 (0.89) −0.00 (1.05) −0.00 (1.03) −0.01 (1.03) 0.10 (1.13) 0.12 (1.15) 0.02 (0.90) −0.14 (0.75)

Note. N’s in the far left column indicate the cumulative numbers across waves for that particular variable.