NEW YORK — Third quarter 2006 revenue increased 11.4 percent for Town Sports International Holdings Inc. (TSI), which went public this spring. Revenue jumped from $98.4 million in the third quarter of 2005 to $109.4 million in the third quarter of 2006. TSI, which owns clubs in major cities from Washington, DC, through New England, attributes its fourth consecutive quarter of double-digit growth to a rise in membership revenue and ancillary club revenue.