overall p value for class variable in GEE model

[m1ny]

Hello,

I built GEE model. Participants have three different measurments(target biomarker) in the three different time.

To look at the effect of different time, model was built like below (time was considered as a class variable in this model, because time was round 1, round 2, and round 3 not exact date. )

I got a p-value for different time points (time2 vs. time1; time3 vs. time1); However, I cannot get the p-value for overall class variable (time). Can I get the p-value for the time variable rather than individual time value?

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proc genmod data=positive_m;
    class RHSP_ID time(ref='1')/param=ref;
    model  ln_aflatoxinB1 = time;
    repeated  subject=RHSP_ID;

run;

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[StatDave]

Use the TYPE3 option in the MODEL statement.