Table 3.
Correlations of WB, urine, and air exposure measures in relation to CC and EC exposure and usage
| Reported tobacco product exposure and use | Median (p25–p75) |
7-Day WB Nicotine (ng/g silicone) ρ (n) |
7-Day WB Cotinine (ng/g silicone) ρ (n) |
UC (ng/mL) ρ (n) |
Air Nicotine (ng/ m3) ρ (n) |
|---|---|---|---|---|---|
| CC variables | |||||
| Child’s exposure to CC inside (cigarettes/week)a | 0.0 (0.0–12.0) |
0.706*** (38) |
0.560* (15) |
0.717*** (38) |
0.723** (38) |
| Residents’ use of CC inside (cigarettes/week)b | 0.9 (0.0–12.0) |
0.725*** (29) |
0.774** (10) |
0.680*** (29) |
0.779** (29) |
| EC variables | |||||
| Child’s exposure to EC inside (min/week)c | 0.0 (0.0–14.8) |
0.353* (38) |
0.083 (18) |
0.470** (38) |
0.351* (38) |
| Residents’ use of EC inside (min/week)d |
0.0 (0.0–17.8) |
0.557** (26) |
0.425 (13) |
0.625*** (26) |
0.455* (26) |
| Residents’ use of EC inside (mL/week)d |
0.0 (0.0–3.3) |
0.581** (26) |
0.406 (13) |
0.646*** (26) |
0.500**(26) |
Note: Bold values are significant (p < .05).
CC = conventional cigarettes; EC = electronic cigarettes; p25–p75 = 25th and 75th percentile.
aExposure of the child in same indoor room based on report of caregiver for 7-day period, excluding exclusive EC use (a subset of classification II from Table 2).
bResidents reported use of CC over 7-day period inside the home whether or not child was present excluding exclusive EC use (a subset of classification III from Table 2).
cExposure of the child in same indoor room based on report of caregiver for 7-day period, excluding any with CC usage (a subset of classification II from Table 2).
dReported caregiver use of EC over 7-day period inside the home whether or not child was present, excluding any with CC usage (a subset of classification III from Table 2).
Spearman’s correlations (ρ): *p < .05, **p < .01, ***p < .001.