This might be a little Perl-golfish, but it offers you named parameters for further processing

use strict;
use Data::Dumper;

$/ = "";

my %stats = map {
        m/(\w+?): .* = \s* (\d+)/xm;
        $1 => $2;
} <DATA>;

print Dumper(\%stats);

__DATA__
Data Collected for SA120:Prct Dirty Cache Pages =            0


Data Collected for SA121:Prct Dirty Cache Pages =            1


Data Collected for SA122:Prct Dirty Cache Pages =            0


Data Collected for SA220:Prct Dirty Cache Pages =            0


Data Collected for SA221:Prct Dirty Cache Pages =            0


Data Collected for SA222:Prct Dirty Cache Pages =            17
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Regards,

- caelifer