Table 1

Results of analyses which regressed in vitro Plasmodium falciparum growth inhibition against each cross-reactive antibody level.


Simple linear regression
Prais-Winsten's regression


half-day††
one-day††
two-day††

(N = 64)
(N = 62)
(N = 50)
(N = 27)

IgM against schizont extract
R2 = 0.50
(P < 0.0001)
R2 = 0.43
(P < 0.0001)
R2 = 0.44
(P < 0.0001)
R2 = 0.56
(P < 0.0001)
IgM against MSP-119
R2 = 0.38
(P < 0.0010)
R2 = 0.16
(P = 0.0016)
R2 = 0.18
(P = 0.0022)
R2 = 0.16
(P = 0.036)
IgG against szhitont extract
R2 = 0.22
(P = 0.0001)
R2 = 0.011
(P = 0.41)
R2 = 0.026
(P = 0.27)
R2not obtained
(P = 1.0)
IgG against MSP-119
R2 = 0.029
(P = 0.18)
R2 = 0.079
(P = 0.063)
R2 = 0.22
(P = 0.0006)
R2 = 0.070
(P = 0.18)

Each regression analysis was conducted against single independent variable. One serum sample (day 6) was not available for antibody measurements and growth inhibition assays. †† For Prais-Winsten's analysis, the data was aggregated in each time-step of half-day, one-day or two-day lengths.

Nagao et al. Malaria Journal 2008 7:113   doi:10.1186/1475-2875-7-113