Table 3 Shewhart’s control rules sensitivity and PPV for predicting depressive episodes within the next 4 weeks
Depressive episodes | Episodes preceded by any rule activation | Rules activated | Rules followed by an episode | |||
|---|---|---|---|---|---|---|
n | n | Sensitivity % (95% CI) | n | n | PPV % (95% CI) | |
Universal X-bar charts | ||||||
Short run-in period cohort | ||||||
Original dataa | 67a | 22a | 33 (22, 46)a | 395a | 34a | 9 (6, 12)a |
LVCF imputed data | 67 | 27 | 40 (29, 53) | 777 | 51 | 7 (5, 9) |
Long run-in period cohort | ||||||
Original data | 32 | 11 | 34 (19, 53) | 456 | 19 | 4 (3, 7) |
LVCF imputed data | 32 | 11 | 34 (19, 53) | 924 | 20 | 2 (1, 3) |
Personalized X-bar charts | ||||||
Short run-in period cohort | ||||||
Original data | 67 | 12 | 18 (10, 30) | 520 | 21 | 4 (3, 6) |
LVCF imputed data | 67 | 15 | 22 (13, 53) | 848 | 33 | 4 (3, 5) |
Long run-in period cohort | ||||||
Original data | 32 | 11 | 34 (19, 53) | 430 | 26 | 6 (4, 9) |
LVCF imputed data | 32 | 10 | 31 (17, 50) | 749 | 27 | 4 (2, 5) |
Individual-moving range charts | ||||||
Short run-in period cohort | ||||||
Original data | ||||||
Individual chart | 67 | 13 | 19 (11, 31) | 785 | 26 | 3 (2, 5) |
Moving range chart | 67 | 38 | 57 (44, 69) | 3790 | 119 | 3 (3, 4) |
LVCF imputed data | ||||||
Individual chart | 67 | 17 | 25 (16, 38) | 1222 | 42 | 3 (3, 5) |
Moving range chart | 67 | 44 | 66 (53, 77) | 5170 | 160 | 3 (3, 4) |
Long run-in period cohort | ||||||
Original data | ||||||
Individual chart | 32 | 12 | 38 (22, 56) | 749 | 30 | 4 (3, 6) |
Moving range chart | 32 | 22 | 69 (50, 83) | 3246 | 61 | 2 (1, 2) |
LVCF imputed data | ||||||
Individual chart | 32 | 12 | 38 (22, 56) | 1170 | 33 | 3 (2, 4) |
Moving range chart | 32 | 23 | 72 (53, 86) | 4451 | 75 | 2 (1, 2) |