/// <summary>Value for identifier.</summary>
        /// <param name="period">    The date.</param>
        /// <param name="cdcField">The cdc field.</param>
        /// <returns>A decimal?</returns>
        private int?GetIntCdc(string period, string cdcField)
        {
            string key = $"{period}{CdcLiterals.Canonical(cdcField)}";

            if ((!_reportByKey.ContainsKey(key)) ||
                (_reportByKey[key].Group == null) ||
                (_reportByKey[key].Group.Count == 0) ||
                (_reportByKey[key].Group[0] == null))
            {
                return(null);
            }

            if (_reportByKey[key].Group[0].MeasureScore != null)
            {
                return((int?)_reportByKey[key].Group[0].MeasureScore.Value);
            }

            if ((_reportByKey[key].Group[0].Population != null) &&
                (_reportByKey[key].Group[0].Population.Count != 0))
            {
                return(_reportByKey[key].Group[0].Population[0].Count);
            }

            return(null);
        }
        /// <summary>Gets int cdc denominator.</summary>
        /// <param name="period">  The date.</param>
        /// <param name="cdcField">The cdc field.</param>
        /// <returns>The int cdc denominator.</returns>
        private int?GetIntCdcDenom(string period, string cdcField)
        {
            string key = $"{period}{CdcLiterals.Canonical(cdcField)}";

            if ((!_reportByKey.ContainsKey(key)) ||
                (_reportByKey[key].Group == null) ||
                (_reportByKey[key].Group.Count == 0) ||
                (_reportByKey[key].Group[0] == null))
            {
                return(null);
            }

            if ((_reportByKey[key].Group[0].Population != null) &&
                (_reportByKey[key].Group[0].Population.Count >= 2))
            {
                return(_reportByKey[key].Group[0].Population[1].Count);
            }

            return(null);
        }