Table 3

Age, body mass, and playing experience of junior and senior rugby league forwards and backs

Age (years)Playing experience (years)Body mass (kg)
ForwardsBacksForwardsBacksForwardsBacks
Values are reported as means (95% CI). Significant team differences (p<0.05) between like superscripts. *Forwards significantly different (p<0.05) from backs. Forwards (n=80; first grade, n=11; second grade, n=16; under 19, n=10; under 16, n=12; under 15, n=11; under 14, n=7; under 13, n=13). Backs (n=79; first grade, n=9; second grade, n=13; under 19, n=12; under 16, n=9; under 15, n=12; under 14, n=10; under 13, n=14).
First grade25.1 (23.0 to 27.2)a23.4 (20.9 to 25.9)19.1 (16.0 to 22.2)a16.2 (13.1 to 19.3)91.9 (85.3 to 98.5)a88.6 (84.4 to 92.8)
Second grade23.8 (22.0 to 25.6)b21.9 (19.5 to 24.3)15.2 (12.2 to 18.2)b13.0 (8.8 to 17.2)99.2 (92.9 to 105.5)b*82.4 (78.8 to 86.0)
Under 1917.8 (17.2 to 18.4)abc17.3 (16.8 to 17.8)10.4 (8.6 to 12.2)ac 9.2 (7.1 to 11.3)89.4 (78.6 to 100.2)c74.2 (67.7 to 80.7)
Under 1615.4 (15.1 to 15.7)abd15.6 (15.3 to 15.9) 7.5 (5.1 to 9.9)ab 8.9 (6.9 to 10.9)75.5 (68.9 to 82.1)abd64.8 (60.2 to 69.4)
Under 1514.5 (14.2 to 14.8)abc14.6 (14.3 to 14.9) 6.6 (4.8 to 8.4)ab 6.1 (3.8 to 8.4)76.5 (70.0 to 83.0)abe*62.1 (57.7 to 66.5)
Under 1413.5 (13.0 to 14.0)abc13.7 (13.4 to 14.0) 6.1 (3.3 to 8.9)ab 5.8 (3.8 to 7.8)67.7 (57.5 to 77.9)abc52.1 (47.4 to 56.8)
Under 1312.5 (12.2 to 12.8)abcd12.3 (12.0 to 12.6) 4.7 (3.2 to 6.2)abc 3.4 (1.9 to 4.9)57.0 (49.0 to 65.0)abcde44.8 (41.5 to 48.1)