Mortality was very high; it is estimated that from 1847 to 1859, the average mortality rate for coolies aboard ships to Cuba was 15.2 percent, and losses among those aboard ships to Peru were as high as 40 percent in the 1850s, and 30.44 percent from 1860 to 1863.
Det anslås, at dødeligheden under transporterne på skibene til Cuba fra 1847 til 1859 var på 15,2 % og at dødeligheden på skibene til Peru i 1850'erne var 40% og 30,44% fra 1860 til 1863.