checkboxes & their labels - order matter?

 
I've been doing forms with checkboxes so that the text label is before
the form input control in HTML, with CSS to put the checkbox to left of
label.

As in:

<p>
<label for="Checkbox1">All information</label><input type="checkbox"
name="all" ID="Checkbox1">
</p>

Is this getting a bit picky? I did it because I thought it might be
better using a screen reader if the text label is first, but not sure
this is really necessary - any thoughts on this?