i am not a expert in the topic but according to my knowledge most of the turtles hactchlings are preyed. So by that logic i could say that predator is important parameter. 

more over gender is determined by the temp, so you can take them as well.

right now i cannot thing of more....:)

predation begins even before the hatching event, nesting is even threatened by the deposition sites destruction. For what I know, newborn turtles are hunted and preyed by lots, from birds to mammals, reptiles and fishes, in dependance from the site. Moreover, smuggling plays an important role in this case.

Survival from nest to adulthood varies widely, the 1 in a 1000 is a rather imprecise guideline and depends on a large amount of factors. I´ll list a few:

1. Body condition and health of the nesting female (depends on the abundance of food in the feeding areas over the year before nesting, when the last nesting migration of the female was, presence of parasites and diseases, among many others). In general you would expect a fatter, healthier turtle to produce better quality eggs, thus giving offspring a slight edge

2. On the nesting beach:

presence of hurricanes, flooding, heavy wave action, very cold or hot temperatures, large temperature fluctuations (can produce intersex turtles), presence and effectiveness of natural or introduced predators, presence of parasites (such as flies that infest nests, time of season when the eggs are laid, and finally a good amount of luck. All these factors may wary wildly among nesting beaches, even if they are located pretty close

3. In the water:

Presence of predators during hatching on the beach and close to shore, Currents that take the hatchlings for a long drift may be favorable or not, abundance and quality of food (Niño years are rather detrimental to primary and secondary productivity in large ocean areas, affecting food abundance for juveniles and adults), fisheries (coastal small-scale and industrial). The so called lost years have a duration of maybe 2-8 years depending on species and location, during that time they are strictly pelagic and ride the currents. After that they move to their feeding grounds which often (except Leatherback and ridley turtles) are coastal, where fisheries become an even larger threat (approx. 80-90% of marine world fisheries catch comes from the coastal and shelf areas).

I would recommend you to check a few of the key words I put in here in google scholar or other databases and get some papers on the topicas that interest you most.

Cheers

Volker