Table 2.

Daycare attendance censored at different time points by case-control status and ethnicity, the NCCLS, 1995 to 2002

Total no. cases/controlsAttended daycare
P* (cases vs controls)
Cases (%)Controls (%)
Censored on the reference date
    Total (294/376)183 (62.2)254 (67.6)0.15
    Hispanic (120/153)63 (52.5)86 (56.2)0.54
    Non-Hispanic White (136/172)99 (72.8)137 (79.6)0.16
    P* (Hispanic vs White)0.001<0.001
Censored 1 y before the reference date
    Total (294/376)152 (51.7)211 (56.1)0.25
    Hispanic (120/153)54 (45.0)66 (43.1)0.76
    Non-Hispanic White (136/172)82 (60.3)116 (67.4)0.19
    P (Hispanic vs White)0.01<0.001
Censored at age 1 y
    Total (294/376)62 (21.1)94 (25.0)0.23
    Hispanic (120/153)22 (18.3)21 (13.7)0.30
    Non-Hispanic White (136/172)34 (25.0)56 (32.6)0.15
    P (Hispanic vs White)0.20<0.001
  • * Ps are from χ2 tests.

  • “Censored” at a specific point in time indicates that exposure occurred after that point is not considered. The “reference date” is the date of diagnosis for cases and the corresponding date for matched controls.