How is the Human povey index - 2 (HPI -2) different from Human povey Index - 1 (HPI - 1, as described in UNDP?

Human povey index for developing countries (HPI-1) The following three dimensions are taken into account: Deprivation of longevity, measured as a percentage of the individuals with a life expectancy lower than 40 years (P1). Deprivation of knowledge, expressed as a percentage of illiterate adults (P2). Deprivation of decent living standards (P3) HPI-2 also considers a fouh dimension, social exclusion, measured with the long-term unemployment rate (P4), that is the percentage of those unemployed for 12 months or over compared to the total work force (the sum of those working and those seeking a job). Ref : Park&;s textbook of preventive and social medicine; 23rd edition