President Uhuru Kenyatta's party has topped a list on voter bribery in March and April while the Opposition coalition has taken second place.
The report compiled by Election Observation Group was released on Friday morning.
It shows that in March, Jubilee Party got a 64 per cent rating while the National Super Alliance got a 46 per cent rating.
Mulle Musau ,the election observer's national coordinator, said April saw an increase in voter bribery with Jubilee getting a 76 per cent score and NASA 61 per cent.
"Election Act, 2016 prohibits offering a bribe,
directly or indirectly,
during an electoral period to influence a voter. During the period, ELOG observers tracked the distribution of money, food stuffs and other commodities by political parties and candidates," he told journalists in Nairobi.
"In 70 per cent constituencies, voter bribery and inducement was observed across the political divide,
indicating an increase in the vice in the month of April compared to March."
Nominations for the August 8 general election took place in April. Many cases of violence and irregularities were reported and several leaders risk being blacklisted.
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In February, a study revealed that the choices of more than half the number of voters will likely be influenced by voter bribery.
The survey was conducted in December last year by Konrad Adenauer Foundation in partnership with the Centre for Multi-party Democracy.
It showed that 56 per cent Kenyans admitted to having been bribed by an aspirant to vote for them.
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Both Uhuru and Raila have pledged tough anti-corruption wars should they win the election but members of the public say the promise will never be fulfilled.
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