The SNP leader admitted the word "national" could be "hugely problematic".
'Tough Call' For Sturgeon In Event Of Brexit
Nicola Sturgeon will face a ''tough decision'' on whether to call another Scottish independence referendum if the UK leaves the European Union with a Heart poll suggesting support has dipped.
The SNP leader has cited a UK vote to leave the EU against Scotland's will as a material change of circumstances from 2014 which would ``almost certainly'' trigger another independence referendum.
But Brexit would only push support for independence up slightly - from 47% to 50% - leaving Scotland split down the middle, a Panelbase poll for Heart and The Sunday Times has found.
Support has dipped from 52% who said they would vote for independence if the UK left the EU in a similar poll in January.
John Curtice, professor of politics at Strathclyde University, told the Sunday Times: ''Although Scotland apparently remains determined to vote by nearly two to one in favour of remaining in the EU, this does not mean that a UK-wide vote to leave would necessarily clear the way for Nicola Sturgeon to hold and win a second independence referendum.
''Such an outcome is more likely to leave her with a tough decision as to whether to call a second referendum at all.''
Mr Curtice said a 50:50 split on independence would leave Ms Sturgeon ``well short of the 60% support for independence she says she would want to see before calling a second referendum''.
Panelbase interviewed 1,021 adults resident in Scotland from April 6-15.
Support for the EU remains higher in Scotland than in England, with 63% supporting continued UK membership of the EU and 37% supporting withdrawal.
Almost twice as many (38%) people believing withdrawal would weaken the economy than those who believe it would be stronger (20%).
A quarter say Brexit would strengthen UK democracy but almost as many (23%) say it would be weaker.
About one in five (21%) believe Scotland would be at less risk of terrorism after Brexit, while 14% think it would be more at risk.
Nearly a third (32%) believe immigration would go down if Britain leaves the EU, and only 10% expect it to go up.
Almost two thirds of Scottish voters (63%) believe that the UK is likely to vote to remain in the EU while just 22% expect Brexit and 15% are unsure.
A police watchdog probe was launched after the remains of the 52-year-old were found in a house in Dumfries in February last year.
The accident happened at about 7.50pm on Thursday in Moodiesburn, North Lanarkshire.
More than 70 firefighters were needed to bring the blaze under control at Blochairn Fruit Market in the early hours of Thursday.
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