['varies', 'according', 'to', 'the', 'level', 'of', 'some', 'other', 'factor.', 'The', 'only', 'detailed', 'results', 'given', 'are', 'reproduced', 'to', 'Table', '3,19.', 'Data', 'from', 'Akiba', 'and', 'Hirayama', 'study', 'do', 'not', 'suggest', 'that', 'the', 'relative', 'risk', 'varies', 'by', 'occupation.', 'Nor', 'was', 'there', 'any', 'variation', 'with', 'socioeconomic', 'status', 'seen', 'in', 'the', 'Garfinkel', 'II', 'study.', 'soxpetatngty,', 'only', 'the', 'Hirayama', 'study', 'has', 'presented', 'data', 'from', 'which', 'the', 'variation', 'in', 'relative', 'risk', 'by', 'age', 'can', 'be', 'calculated.', 'This', 'shows', 'an', 'unexpected', 'pattern,', 'with', 'the', 'relative', 'risk', 'declining', 'sharply', 'from', '2.76', 'at', 'age', '40-49', 'to', '0.19', 'at', 'age', '70-79.', 'The', 'declining', 'trend', 'in', 'relative', 'risk', 'with', 'increasing', 'age', 'is', 'statistically', 'significant', '(p<0.05).', 'Garfinkel', 'II', 'has', 'presented', 'data', 'showing', 'how', 'the', 'relative', 'risk', 'varies', 'according', 'to', 'the', 'respondent.', 'Compared', 'with', 'an', 'overall', 'relative', 'risk', 'estimate', 'of', '1.23', 'for', 'husband', 'smoking,', 'estimates', 'varied', 'from', '0.77', 'and', '0.83', 'when', 'the', 'husband', 'or', 'the', 'woman', 'herself', 'provided', 'the', 'data', 'to', '3.57', 'when', 'her', 'son', 'or', 'daughter', 'provided', 'the', 'data', 'or', '1.58', 'when', 'another', 'person', 'did.', 'The', 'relative', 'risk', 'estimates', 'are', 'highly', 'significantly', 'heterogeneous', '(p<0.001).', 'Varela', 'also', 'presented', 'relative', 'risk', 'estimates', 'according', 'to', 'whether', 'the', 'subject', 'responded', '(RR', '=', '0.93', 'for', 'spouse', 'smoking)', 'or', 'whether', 'a', 'surrogate', 'did', '(RR', '=', '0.44).', 'These', 'estimates,', '‘which', 'were', 'for', 'sexes', 'combined,', 'did', 'not', 'differ', 'significantly.', 'No', 'other', 'detailed', 'results', 'are', 'given,', 'though', 'there', 'is', 'mention', 'in', 'some', 'papers', 'of', 'investigations', 'being', 'made', 'but', 'not', 'showing', 'any', 'clear', 'differences.', 'For', 'example,', 'Akiba', 'et', 'al.(1986)', 'noted', 'that', '"the', 'trends', 'with', 'husbands’', 'smoking', 'tended', 'to', 'be', 'seen', 'throughout,', 'with', 'no', '_', 'strong', 'differences', 'by', 'age', 'group', 'or', 'by', 'city', 'of', 'residence.', 'The', 'trends', 'were', 'also', 'apparent', 'for', 'each', 'type', 'of', 'informant"', 'and', 'that', '"no', 'significant', 'influence', 'CpSpalyzo?']