Table 1.
Means and standard deviations for measures of negative affect, panic symptoms, blood pressure and heart rate by experiment
| Experiment 1 | Experiment 2 | |
|---|---|---|
| Negative affect (NA) | ||
| Baseline | 12.00 (2.32) | 12.89 (2.36) |
| Air | 12.20 (3.91) | 11.39 (2.10) |
| CO2 | 14.84 (4.87)* | 18.43 (8.06)* |
| Panic symptoms (API) | ||
| Baseline | 1.60 (2.80) | 2.29 (2.99) |
| Air | 2.98 (3.67) | 2.86 (3.95) |
| CO2 | 10.18 (7.34)* | 17.54 (8.32)* |
| Systolic blood pressure | ||
| Baseline | 116.72 (12.86) | 119.22 (13.12) |
| Air | 114.07 (13.75) | 116.46 (11.27) |
| CO2 | 128.30 (17.91)* | 140.82 (21.54)* |
| Heart rate | ||
| Baseline | 70.45 (10.63) | 71.93 (10.29) |
| Air | 74.28 (11.72) | 73.25 (9.42) |
| CO2 | 76.98 (12.59)** | 91.89 (17.61)* |
NA Negative Affect Schedule subscale, API Acute Panic Inventory
* denotes significant difference between CO2 and baseline only; ** denotes significant difference between CO2 relative to baseline and air