[['district', 'incumbent', 'party', 'first elected', 'result', 'candidates'], ['ohio 1', 'tom luken', 'democratic', '1974', 'lost re - election republican gain', 'bill gradison (r) 50.9% tom luken (d) 49.1%'], ['ohio 3', 'charles w whalen , jr', 'republican', '1966', 're - elected', 'charles w whalen , jr (r) unopposed'], ['ohio 5', 'del latta', 'republican', '1958', 're - elected', 'del latta (r) 62.5% bruce edwards (d) 37.5%'], ['ohio 6', 'bill harsha', 'republican', '1960', 're - elected', 'bill harsha (r) 68.8% lloyd allan wood (d) 31.2%'], ['ohio 12', 'samuel l devine', 'republican', '1958', 're - elected', 'samuel l devine (r) 50.9% fran ryan (d) 49.1%'], ['ohio 16', 'ralph regula', 'republican', '1972', 're - elected', 'ralph regula (r) 65.6% john g freedom (d) 34.4%'], ['ohio 18', 'wayne l hays', 'democratic', '1948', 're - elected', 'wayne l hays (d) 65.6% ralph h romig (r) 34.4%'], ['ohio 21', 'louis stokes', 'democratic', '1968', 're - elected', 'louis stokes (d) 82.0% bill mack (r) 18.0%']]
the average year an Incumbent was First Elected is 1963
the average year an [ENT] was [ENT] is 1963