What is the tick rate and the damage per tick of each circle?

In PUBG, each circle deals damage in a constant tickrate. The damage dealt increases with each circle while the tickrate seems constant. At the time of writing this question, damage dealt is constant no matter the distance to the next circle, which was changed in a later update. Assuming the player is not boosted, how much damage in HP% does each circle deal per tick?

This information would be helpful to assess, at what HP% you would have to take meds (Med Kit, First Aid Kit, ...) to avoid dying to the zone.

There is a reddit analysis video that goes more in depth. But he posted the stats below it as well:

• Circle 1 Length - 4550m Damage - 0.4% Survive for - 4:10 Travel time - 5:00
• Circle 2 Length - 2970m Damage - 0.6% Survive for - 2:46 Travel time - 2:20
• Circle 3 Length - 1480m Damage - 0.8% Survive for - 2:05 Travel time - 1:30
• Circle 4 Length - 740m Damage - 1% Survive for - 1:40 Travel time - 1:00
• Circle 5 Length - 360m Damage - 3% Survive for - 0:34 Travel time - 0:40
• Circle 6 Length - 175m Damage - 5% Survive for - 0:20 Travel time - 0:30
• Circle 7 Length - 90m Damage - 7% Survive for - 0:15 Travel time - 0:30
• Circle 8 Length - 40m Damage - 11% Survive for - 0:10 Travel time - ~

As of 26-10-2017 there was an update changing the damage to be increased the further away one from the safe-zone circle is. Meaning this information is no longer correct.

There is a Handy Chart that I found on Reddit that summarizes how much damage each circle does, as well as when you need to heal in order to survive. The amount of health in which you need to start Healing assumes you are using either a First-Aid kit or Medkit, boosts will make it easier to survive (as they will passively heal you while you are using the First-Aid or Medkit). Keep in mind that medkit's take 8 seconds to use whereas First-aid only takes 6 seconds, so it is safer to First-aid, then Medkit if you have the resources to spare.

Circle Damage Summarized, and when you should Medkit/First Aid
Circle 1: 0.50 dps       Heal before: 5%
Circle 2: 0.75 dps       Heal before: 8%
Circle 3: 1.00 dps       Heal before: 10%
Circle 4: 1.50 dps       Heal before: 15%
Circle 5: 3.00 dps       Heal before: 30%
Circle 6: 5.00 dps       Heal before: 50%
Circle 7: 7.50 dps       Heal before: 77%
Circle 8: 11.0 dps       Just Heal immediately
Circle 9: 11.0 dps       Just Heal immediately (you will probably die anyway)

Source.