ttest of means with nearest neighbor matching - attnd

[Juancarlos]

Hi, i´m working with propensity score matching (pscore) and nearest neighbor matching (attnd). I need to make ttest of means of the outcome variable.
When I apply the pscore I get the following result:

Inferior |
of block | Treatment
of pscore | 0 1 | Total
-----------+----------------------+----------
.0009014 | 748 9 | 757
.05 | 136 12 | 148
.1 | 167 24 | 191
.2 | 219 94 | 313
.4 | 49 43 | 92
.6 | 2 1 | 3
-----------+----------------------+----------
Total | 1,321 183 | 1,504


And when I apply the attnd the result is as follows:

---------------------------------------------------------
n. treat. n. contr. ATT Std. Err. t
---------------------------------------------------------

183 140 0.292 0.187 1.564

---------------------------------------------------------

Attached images for better view

the questions are:

1) How I can make the ttest of means between 183 and 140 treated controls calculated by the attnd?

2) Is correct to do the ttest between 183 treated and 140 controls? or should I do the ttest between 183 treated and 1321 controls calculated by the pscore?

Thank you very much for the help and suggestions that can give me.

Juan Carlos Núñez