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Notes:
The number density of stars at a particular mass is most likely some function of mass. The functional form of the number also depends on the low mass and high mass cutoffs in the primordial epoch, a question that is still debated about present day star formation.
The question of whether stars formed in binary pairs or clusters is important in the determination of the angular momentum of the parent cloud/DM halo. Much of the progenitor's angular momentum could go into the orbital motion of stars in clusters.
Either radiative or chemical negative feedback could cause the termination of the population II epoch. The UV photons produced by the first stars could dissociate the surrounding H2 molecules. Enrichment of the ISM by the first SN explosions would allow lower mass stars to form, thus ending the low-metalicity, high-mass epoch.