Derivation
variable: bcgvc (table[s]: cen_individ, crs_bfup, crs_birth, crs_cenm, css_sei_all, gp_va, tmt_tmtv, ves_vese)
variable: vhc1 (table[s]: crs_birth)
variable: vcentre (table[s]: crs_cenm)variable: bcgvc (table[s]: cen_individ, crs_bfup, crs_birth, crs_cenm, css_sei_all, gp_va, tmt_tmtv, ves_vese)
variable: vhc1 (table[s]: crs_birth)
variable: vcentre (table[s]: crs_cenm)variable: bcgvc (table[s]: cen_individ, crs_bfup, crs_birth, crs_cenm, css_sei_all, gp_va, tmt_tmtv, ves_vese)
variable: vhc1 (table[s]: crs_birth)
variable: vcentre (table[s]: crs_cenm)