Regional distribution(% ex-actuator dose corrected for tissue attenuation) of extrafine aerosol 99mTc-hydrofluoroalkane-beclomethasone dipropionate (HFA-BDP or QVARTM; 3M Health Care Ltd, Loughborough, UK) in the tidal breathing groups
| Age group yrs | Lungs % | Oropharynx+gastrointestinal % | Spacer % | Expiratory filter % |
| 5–7 | 35.4±18.3 | 24.0±10.5 | 40.2±9.2 | 0.40±0.26 |
| 8–10 | 47.5±13.0 | 10.3±4.4 | 41.5±15.1 | 0.66±0.78 |
| 11–17 | 54.9±11.2 | 10.1±6.2 | 30.7±11.5 | 4.3±4.4 |
Data are presented as mean±sd.