The Department of Health has made public the evidence used to inform its decisions on managing the Covid-19 pandemic.
The evidence includes the executive’s paper on “non-pharmaceutical options for reducing the risk of Covid-19”.
It assesses the effectiveness behind measures on travel, personal contacts and education.
The paper also outline reasons for the four-week lockdown currently in place in Northern Ireland.
This has seen the closure of hospitality businesses, with pubs and restaurants limited to takeaway only.
The paper says the closure could have a moderate impact on transmission of the virus, with a potential reduction in the R rate of transmission of between 0.1 and 0.2.
It says curfews are “likely to have a marginal impact”.
Included in the documents are papers from the government’s Scientific Advisory Group for Emergencies, slides presented at Stormont press conferences and the weekly reports on the R number.
R is the number of people that one infected person will pass on a virus to, on average,
The Chief Scientific Advisor Prof Ian Young said the evidence bank will help inform discussion about the pandemic response.
Earlier on Tuesday Prof Young said there was “strong evidence” that coronavirus restrictions imposed in the Derry City and Strabane council area are making a difference.
Many businesses who have had to close their doors for four weeks asked to see evidence of how ministers reached their decisions.
The NI Executive’s paper published on Tuesday says the closure of close contact businesses like hairdressers and beauticians will have a low impact on transmission with a potential reduction of 0.05%.
It also recognises this will have a high direct impact on staff who are losing their income which it says is “likely to disproportionately affect the poorest (and women) given employment in personal services”.
The paper also says evidence suggests masks were effective in stopping transmission in a hair dressing salon, but that there was some evidence of transmission among hairdressers in the UK.
On outdoor dining, it says allowing customers to eat outside is “only likely to be much lower risk.”
It cites a report produced by the Centre for Disease Control, the United States’ health protection agency, which suggests those who test positive are twice as likely to have eaten in a restaurant.
It also says there will be “high indirect impacts” resulting from the loss of income of hospitality workers.