In all trials in civil actions in any court in this state, a verdict shall be rendered if five-sixths or more of the members of the jury concur therein, and such verdict shall have the same force and effect as though agreed to by all members of the jury; Provided, that a verdict concurred in by less than all members of the jury shall not be rendered until the jury shall have had an opportunity for deliberation and consideration of the case for a period of not less than six hours after the same is submitted to said jury. If a verdict be concurred in by all the members of the jury, the foreman alone may sign it, but if rendered by a less number, such verdict shall be signed by all the jurors who shall agree to the verdict.