In adjusted models , being married was associated with lower night-time SBP ( -2.4 mmHg ; 95 % CI -3.8 to -0.9 mmHg ; P = 0.002 ) , with the suggestion of a greater association in married men compared with married women ( -3.1 vs. -1.7 mmHg ) ; there was less difference for married nonblacks compared with married blacks ( -2.7 and -2.4 mmHg , respectively ) .