Table 1.
Descriptive Statistics for 5-Minute Wetted Lengths (mm) of Unsheathed and Sheathed Schirmer Strips
| Variable |
Minimum |
Maximum |
Median |
Mean |
SD |
| Unsheathed strips | |||||
| Wetted length, mm, visit 1 | 2.5a | 26.0 | 7.5 | 8.9 | 6.81 |
| Exam room temperature, °C, visit 1 | 22.2 | 23.4 | 22.8 | 22.8 | 0.34 |
| Exam room relative humidity, %, visit 1 | 44 | 53 | 49.5 | 48.9 | 2.86 |
| Wetted length, mm, visit 2 | 2.5a | 18.0 | 7.0 | 8.2 | 5.36 |
| Exam room temperature, °C, visit 2 | 21.3 | 23.3 | 22.6 | 22.6 | 0.46 |
| Exam room relative humidity, %, visit 2 | 35 | 57 | 49 | 48.6 | 5.58 |
| Sheathed strips | |||||
| Wetted length, mm, visit 1 | 2.5a | 35.0 | 12.0 | 12.0 | 8.81 |
| Exam room temperature, °C, visit 1 | 21.9 | 23.4 | 22.7 | 22.7 | 0.38 |
| Exam room relative humidity, %, visit 1 | 44 | 54 | 50 | 49.5 | 2.83 |
| Wetted length, mm, visit 2 | 2.5a | 35.0 | 10.5 | 11.9 | 8.18 |
| Exam room temperature, °C, visit 2 | 21.4 | 23.4 | 22.8 | 22.7 | 0.51 |
| Exam room relative humidity, %, visit 2 | 39 | 55 | 50 | 49.1 | 4.57 |
a
Minimum wetted length was interpolated to the median of unobservable region of the Schirmer strip (2.5 mm).