Table 5 

A soluble bacterial product limits life span extension by BD. 

A. 



Cohort 
n 
Mean Survival 
Median Survival 
% extension of Median 
pvalue 


CF 
110 
25.1 ± 0.5 
23 
 
 
BD 
74 
34.3 ± 0.9 
34 
48 
1.4 × 10^{15} 
BD + LB 
94 
35.9 ± 0.8 
37 
61 
1.4 × 10^{19} 
BD + sup 
116 
30.2 ± 0.8 
31 
35 
2.3 × 10^{07} 
Agar Barrier 
113 
29.6 ± 0.8 
31 
35 
4.0 × 10^{05} 


B. 



CF 
BD 
BD + LB 
BD + sup 
Agar Barrier 



CF 
 
1.4E13 
1.4E19 
2.3E07 
4.0E05 
BD 
 
 
2.6E01 
1.0E03 
7.7E04 
BD + LB 
 
 
 
2.2E06 
2.6E06 
BD + sup 
 
 
 
 
6.4E01 
Agar Barrier 
 
 
 
 
 


Life span was measured for N2 on plates with food (control fed, CF), plates without food (bacterial deprivation, BD), BD plates treated with LB (BD + LB) or cellfree supernatant from an E. coli OP50 culture (BD + sup), or plates containing a lawn of E. coli OP50 beneath the surface of the agar (Agar Barrier). (A) The number of animals (n), mean survival (± standard error, SE), median survival, percent extension of the median, and pvalues are given for each strain and condition. Data shown here are pooled from two independent trials. Pvalues were calculated by the Wilcoxon RankSum test using the MATLAB 'ranksum' function. (B) Pairwise comparisons to test for significant differences between median life span were made for each experimental condition and pvalues are given for each pair. 

Smith et al. BMC Developmental Biology 2008 8:49 doi:10.1186/1471213X849 