Table 1 Descriptive statistics
From: The time-varying role of the family in student time use and achievement
Sample | Full | Matched | Sibling-pair | |||
|---|---|---|---|---|---|---|
Student-year observations | 5,896,480 | 3,781,981 | 1,241,126 | |||
Unique students | 1,832,309 | 1,088,628 | 524,792 | |||
Unique schools | 2144 | 2144 | 2141 | |||
Match rate to birth data | 0.641 | |||||
Unique mothers | 696,632 | 226,562 | ||||
Math score (std devs) | 0 | (1) | −0.012 | (0.988) | −0.026 | (1.008) |
Reading score (std devs) | 0 | (1) | −0.014 | (0.989) | −0.061 | (1.008) |
Homework (std devs) | 0 | (1) | −0.013 | (0.989) | −0.028 | (0.988) |
Free reading (std devs) | 0 | (1) | −0.048 | (0.969) | −0.058 | (0.968) |
Computer use (std devs) | 0 | (1) | −0.027 | (0.974) | −0.036 | (0.965) |
TV watching (std devs) | 0 | (1) | 0.023 | (1.003) | 0.009 | (1.015) |
Homework (h/week) | 2.41 | (2.37) | 2.39 | (2.35) | 2.35 | (2.34) |
Free reading (h/day) | 0.80 | (0.63) | 0.77 | (0.61) | 0.77 | (0.60) |
Computer use (days/month) | 3.01 | (5.90) | 2.84 | (5.73) | 2.80 | (5.69) |
TV watching (h/day) | 2.51 | (1.99) | 2.56 | (2.00) | 2.53 | (2.02) |
White | 0.558 | 0.600 | 0.595 | |||
Black | 0.276 | 0.293 | 0.305 | |||
Hispanic | 0.097 | 0.050 | 0.039 | |||
Other race | 0.037 | 0.029 | 0.031 | |||
Multiracial | 0.031 | 0.028 | 0.029 | |||
Female | 0.493 | 0.494 | 0.495 | |||
Subsidized lunch | 0.448 | 0.437 | 0.512 | |||
Mother education | 12.6 | (2.5) | 12.6 | (2.5) | ||
Mother age | 26.0 | (5.9) | 25.4 | (5.6) | ||
Mother married | 0.656 | 0.661 | ||||
Mother immigrant | 0.072 | 0.057 | ||||
No father information | 0.137 | 0.146 | ||||
Father education | 12.7 | (2.5) | 12.8 | (2.5) | ||
Father age | 29.0 | (6.6) | 28.6 | (6.3) | ||
Father immigrant | 0.085 | 0.074 | ||||
First born | 0.437 | 0.323 | ||||
Birth weight | 7.29 | (1.31) | 7.21 | (1.38) | ||
Alcohol when pregnant | 0.012 | 0.012 | ||||
Tobacco when pregnant | 0.172 | 0.172 | ||||