Using analyses of covariance on a per-protocol sample , there were no differences noted between the MBCR and SET groups with regard to the telomere/single-copy gene ratio , but a trend effect was observed between the combined intervention group and controls ( F -LSB- @,@ -RSB- , @ ; P = @ ; ( @ ) = @ ) ; TL in the intervention group was maintained whereas it was found to decrease for control participants .