text: select num.stratum_1 as x_calendar_month,   -- calendar year, note, there could be blanks
  	1000*(1.0*num.count_value/denom.count_value) as y_prevalence_1000pp  --prevalence, per 1000 persons
  from 
  	(select * from ACHILLES_results where analysis_id = 502) num
  	inner join
  	(select * from ACHILLES_results where analysis_id = 117) denom on num.stratum_1 = denom.stratum_1  --calendar year
  ORDER BY CAST(num.stratum_1 as INT)
  