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Table 6 Descriptive statistics for the location and slope parameters for the final items

From: Assessment of health-related quality of life in arthritis: conceptualization and development of five item banks using item response theory

Statistic Daily Activities Walking Handling Objects Pain or Discomfort Feelings
  Location Slope Location Slope Location Slope Location Slope Location Slope
Mean -0.664 1.610 -0.097 1.729 -0.774 1.354 -0.497 1.294 -0.573 1.154
SD 0.805 0.463 0.859 0.550 0.897 0.409 0.834 0.544 0.819 0.390
Min. -2.237 0.970 -1.274 0.611 -1.698 0.662 -1.896 0.649 -2.349 0.560
25% -1.434 1.264 -0.708 1.346 -1.341 1.036 -1.169 0.859 -1.186 0.863
Median -0.511 1.466 -0.380 1.747 -1.180 1.278 -0.352 1.102 -0.639 1.071
75% 0.014 1.947 0.456 2.145 -0.451 1.707 0.071 1.627 0.211 1.434
Max. 0.546 3.156 1.958 2.695 2.272 2.104 1.637 2.546 1.011 1.989