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. Author manuscript; available in PMC: 2012 Mar 1.
Published in final edited form as: Dev Psychol. 2011 Mar;47(2):344–363. doi: 10.1037/a0021027

Table 1.

Numbers of Weighted Cases by Level of Work Intensity at Age 18a

8th-Grade
Panelb
12th-Grade
Panels
Graduating Classes 1995–1997 1976–2003 1976–1995
Outcome Data Collected 1999–2001 1979–2007 1987–2007
Wtd. N % Wtd. N % Wtd. N %

Working
(not for pay)
2215 6.9% 1317 7.4%
0 hours 571 32.5% 7128 22.3% 3900 21.8%
1–5 hours 87 4.9% 2072 6.5% 1187 6.6%
6–10 hours 147 8.4% 2761 8.6% 1558 8.7%
11–15 hours 190 10.8% 3388 10.6% 1938 10.8%
16–20 hours 258 14.6% 5129 16.0% 2851 15.9%
21–25 hours 195 11.1% 3973 12.4% 2234 12.5%
26–30 hours 150 8.5% 2525 7.9% 1376 7.7%
31+ hours 160 9.1% 2793 8.7% 1558 8.7%

Total 1758 100.0% 31984 100.0% 17920 100.0%

aCases are restricted to those who participated in the relevant follow-up survey, and are weighted to adjust for initial probability of selection, absenteeism during the base-year data collection, and panel attrition.

bData shown only for those who were in school in 1995–1997; dropouts and those who completed the surveys after graduation are excluded.