Table 1.

Point estimate, bootstrapped standard error and 95%Wald-type confidence interval

	Est	SE	95% CI		Est	SE	95% CI
${\widehat{\tau }}_{\text{reg},2}$	0.0178	0.0112	(−0.0047, 0.0402)	${\widehat{\tau }}_{\text{reg},2\&\text{reg}}$	0.0155	0.0023	(0.0109, 0.0200)
${\widehat{\tau }}_{\text{IPW},2}$	0.0175	0.0111	(−0.0048, 0.0398)	${\widehat{\tau }}_{\text{IPW},2\text{\&IPW}}$	0.0155	0.0024	(0.0108, 0.0202)
${\widehat{\tau }}_{\text{AIPW},2}$	0.0179	0.0111	(−0.0044, 0.0402)	${\widehat{\tau }}_{\text{AIPW},2\&\text{AIPW}}$	0.0156	0.0024	(0.0109, 0.0203)
${\widehat{\tau }}_{\text{mat},2}$	0.0077	0.0092	(−0.0106, 0.021)	${\widehat{\tau }}_{\text{mat},2\&\text{mat}}$	0.0079	0.0053	(−0.0027, 0.0184)