2-2. Helmet Ejection and How Helmets Are Worn
  Cases of helmet ejection are then studied by the ways they were worn: whether they were "worn properly" or "chin strap too loose or not fastened". As shown in Figure 11, helmets were properly worn in 283 cases, only in 6 of which helmets came off in the accident (2.1%). Note, however, that 4 of them were half helmets, which cover a relatively small area of the head and shift easily.
  A loosely fastened chin strap makes it even easier for the helmet to shift. Some accident victims may have thought they were wearing their half helmets properly, but in fact they did not fasten the chin strap securely enough.

Figure 11. Ejection when Worn Properly
  There were 57 accidents in which riders or passengers were wearing helmets with the chin strap loosely fastened or not fastened at all (Figure 12). Of these, helmet ejection occurred in 47 cases (82.5%).
  All the "open face", "others" and "unknown" helmets not fastened securely came off in the accident (100%),
although the numbers were small. Ejection rate was likewise high for half helmets and full face helmets when the
chin strap was not fastened securely: 87.5% and 66.7%, respectively.

Figure 12. Helmet Ejection When Chin Strap Was Loosely Fastened or Not Fastened

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Institute for Traffic Accident Research and Data Analysis (ITARDA)