TABLE 4

Longitudinal Patterns of Use of E-cigarette Products (χ2 Test for Independence)

Characteristics of E-cigarettes Used at Wave 1Wave 2: No Longer a Past 30-d Regular User, %Wave 2: Closed Systems, %Wave 2: Open Systems, %
DisposableRechargeable
Disposable (n = 49)68.62.029.4
Rechargeable (n = 111)68.44.527.2
CartridgeNo cartridge
Uses a cartridge (n = 50)75.70.024.3
Does not use a cartridge (n = 103)64.02.433.5
Not refillableRefillable
Refillable (n = 61)72.61.426.0
Not refillable (n = 97)61.44.733.9
  • No tests were statistically significant.