We further extracted from the measured speckle contrast improved information on the nonperfusion and perfusion components in the porcine burns by computing the SDR and for each burn [using Eqs. (3) and (5), respectively], and subsequently quantifying their change relative to the SDR and of normal porcine skin, respectively. Figures 6(b) and 6(c) show, respectively, the box plots of relative SDR and by the four burn groups (of contact times of 10, 20, 30, 40 s) at 8, 32, and 104 hpb. A few points can be drawn from these figures as follows: (i) At 8 hpb, all burn types experienced an increase in SDR and a decrease in relative to normal skin, implying the higher static-to-dynamic scattering composition ratio and lower blood perfusion of the wounds (with respect to normal porcine skin). However, similarly to the speckle contrast measured at 8 hpb [Fig. 6(a)], no significant difference between the four burn groups was identified neither by the SDR nor by at 8 hpb. (ii) At 32 hpb, the median values of the normalized SDR () of the four burn groups remained higher (lower) than those measured for normal skin but lower (higher) than those at 8 hpb, indicating a possible initial recovery of the burns. Most importantly, while SDR at 32 hpb showed a statistically significant correlation to probe contact times (, ) and significantly distinguished the 40-s burns from the three other burn types, at 32 hpb presented a statistically insignificant correlation to inflictor contact times and significantly distinguished between the 30- and 10-s burns only. These results show that the SDR, rather than , can largely control the ability of the measured speckle contrast to distinguish burns of different severity with statistical significance, suggesting that relative changes in the static-to-dynamic scattering composition of burns can dominate relative changes in blood flow for burns of different depth. (iii) At 104 hpb, the median SDR () of the four burn groups remained higher (lower) than that measured for normal skin but was lower (higher) than those at 32 hpb (except for the SDR of the 30-s burns), implying the progress of healing of the burns in terms of reduced static-to-dynamic scattering composition ratio and increased blood perfusion of the wounds. Unlike speckle contrast measured at 104 hpb, no significant difference between the four burn groups was identified neither by the SDR nor by [probably due to the noisier estimates for SDR and at 104 hpb, as seen in Figs. 6(b) and 6(c), respectively].