Table 6. Estimation of DZ twinning rate (DZr), MZ twinning rate (MZr) and the absolute number of DZ and MZ twin pairs in LSP and CG-LSP.

	LSP				CG-LSP
	1927–1958		1959–2008		1927–1958		1959–2008
	SS	OS	SS	OS	SS	OS	SS	OS
	4	7	9	23	16	7	14	51
Total births	Unknown		469		Unknown		5793
DZr *			3.8380%				0.4833%
Var(DZr) *			0.0161%				0.0002%
MZr *			2.9851%				0.6387%
Var(MZr) *			0.0144%				0.0002%

SS, same sex twin pairs; OS, opposite sex twin pairs.

*estimated using data from 1959–2008 only.