| Percentage of patients reporting ease of erythropoietin pen device use | Percentage of patients reporting ease of taking accurate dose | ||||

| Visit 1 (N = 259) N(%) | Visit 2 (N = 259) N(%) | Visit 3 (N = 259) N(%) | Visit 1 (N = 259) N(%) | Visit 2 (N = 259) N(%) | Visit 3 (N = 259) N(%) |

Very easy | 209(80.7%) | 245(94.6%) | 249(96.1%) | 236(91.1%) | 246(95%) | 249(96.1%) |

Somewhat easy | 049(18.9%) | 014(5.4%) | 10(3.9%) | 22(8.5%) | 13(5%) | 10(3.9%) |

Neither easy nor difficult | - | - | - | - | - | - |

Somewhat difficult | 001(0.4%) | - | - | 1(0.4%) | - | - |

Very difficult | - | - | - | - | - | - |

P value (Chi-square test) |
| 0.001 (Chi-square value 23.104) | 0.001 (Chi-square value 30.160) |
| 0.84 (Chi-square value 2.985) | 0.001 (Chi-square value 5.469) |