Table 2

Percentage of packs of cigarettes by neighbourhood over time

Census tract Time 1 Aug 1994 Time 2 Aug 1995 Time 3 Aug 1996 Time 4 March 1998 Time 5 Jan 1999 Row analyses: within tracts over time
White39.3%22.9%35.4%11.5%15.1%Time 1 > 2 = 3 > 4 = 5
Black38.9%36.5%28.1%14.9%13.9%Time 1 = 2 = 3 > 4 = 5
Latino45.5%37.5%40.6%11.5%16.6%Time 1 = 2 = 3 > 4 = 5
Column analyses: between tracts ( df=2 for each)χ2 = 1.6 nsχ2 = 5.81nsχ2 = 3.34 nsχ2 = 1.96 nsχ2 = 0.79 ns
  • Within tract over time effects:

  • White tracts: time 1 v 2 χ2 (df 1) = 7.05, p = 0.008; time 1v 3 χ2 (df 1) = 0.373, p = 0.54; time 1 v 4 ÷ χ2 (df 1) = 41.92, p = 0.0005; time 1v 5 χ2 (df 1) = 29.69, p = 0.0005; time 2 v 3 χ2 (df 1) = 3.63, p = 0.06; time 2v 4 χ2 (df 1) = 7.23, p = 0.007; time 2 v 5 χ2 (df 1) = 2.99, p = 0.08; time 3v 4 χ2 (df 1) = 26.80, p = 0.0005; time 3 v 5 χ2 (df 1) = 17.52, p = 0.0005; time 4v 5 χ2 (df 1) = 1.39, p = 0.24.

  • Black tracts: time 1 v 2 χ2 (df 1) = 0.15, p = 0.70; time 1v 3 χ2 (df 1) = 2.95,,p = 0.09; time 1 v 4 χ2 (df 1) = 31.19, p = 0.0005; time 1v 5 χ2 (df 1) = 34.71, p = 0.0005; time 2 v 3 χ2 (df 1) = 1.53, p = 0.22; time 2v 4 χ2 (df 1) = 20.62, p = 0.0005; time 2 v 5 χ2 (df 1) = 23.34, p = 0.0005; time 3v 4 χ2 (df 1) = 8.41, p = 0.004; time 3 v 5 χ2 (df 1) = 10.13, p = 0.001; time 4v 5 χ2 (df 1) = 0.13, p = 0.72.

  • Latino tracts: time 1 v 2 χ2 (df 1) = 1.49, p = 0.22; time 1v 3 χ2 (df 1) = 0.55, p = 0.46; time 1 v 4 χ2 (df 1) = 62.22, p = 0.0005; time 1v 5 χ2 (df 1) = 41.48, p = 0.0005; time 2 v 3 χ2 (df 1) = 0.19, p = 0.66; time 2v 4 χ2 (df 1) = 32.73, p = 0.0005; time 2 v 5 χ2 (df 1) = 18.59, p = 0.0005; time 3v 4 χ2 (df 1) = 39.76, p = 0.0005; time 3 v 5 χ2 (df 1) = 23.94, p = 0.0005; time 4v 5 χ2 (df 1) = 2.99, p = 0.08.

  • ns, not significant.