Table 1.

Strain-Differences in Blood Pressure, Body Weight and Survival among S and Congenic Rat Strains.

Strain	BP, week 3, mm Hg	BP, week 4, mm Hg	Body weight, initial, g	Days Survived on 4% NaCl diet
S	173.5 ± 4.0 [15]	181.9 ± 4.1 [15]	161.0 ± 2.1 [20]	64.8 ± 6.4 [21]
RNO3	154.7 ± 1.7 [15]	160.5 ± 2.3 [15]	145.1 ± 3.6 [15]	96.9 ± 7.1 [15]
RNO3 + RNO7	152.7 ± 2.6 [16]	157.8 ± 3.2 [16]	150.2 ± 3.4 [20]	126.4 ± 8.5 [20]
RNO7	160.5 ± 3.0 [14]	170.8 ± 3.3 [14]	150.2 ± 2.5 [19]	72.5 ± 6.8 [19]
P (overall)	<0.0001	<0 .0001	<0.0001	0.002
P (S vs. RNO3)	0.002	0.001	0.002	0.002
P (S vs. RNO3 + RNO7)	0.001	0.0004	0.015	<0.0001
P (S vs. RNO7)	NS, 0.067	0.052	0.004	NS
P (RNO3 vs. RNO3 + RNO7)	NS	NS	NS	0.016
P (RNO3 vs. RNO7)	NS	0.018	NS	0.009
P (RNO7 vs. RNO3 + RNO7)	NS	0.013	NS	<0.0001

BW was measured on 40-42 day-old Experiment 1 rats. Tail-cuff BP was measured during the third (days 17 and 18) and fourth weeks (days 26 and 27) on a 2% NaCl diet. After BP measurement, rats were maintained on a 4% NaCl diet until they died or became moribund. Numbers of rats per strain measured for each trait are in brackets. NS, not significant (P>0.05).