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Table 1 Comparison of reported numbers of participants found with lice and with louse nymphs following first treatment using different dimeticone based products

From: Dimeticone 4% liquid gel found to kill all lice and eggs with a single 15 minute application

Study Lice present before day 7 Percent Nymphs present before day 7 Percent Probability
Hedrin lotion overnight [1] * 91/127 71.6 86/127 67.7 a
ISRCTN47755726 Hedrin lotion overnight [2] * 32/43 74.4 27/43 62.8 a
ISRCTN15117709 Nyda L lotion overnight [6] ** 26/73 35.6 Data not available - b
ISRCTN50373146 Hedrin liquid gel 1 hour * 3/42 7.1 2/42 4.8 c
ISRCTN59227204 Hedrin liquid gel 15 min 0/41 0.0 0/41 0.0 c
  1. * Treatments used with two applications 7 days apart
  2. ** Treatment instructions originally recommended two applications with combing but now indicate one application may be effective with a repeat after 8 days if lice persist
  3. Probability: Differences between groups were determined using Fisher's exact test. Groups with the same letter were not significantly different from each other. Differences were detected between groups 'a' and 'b' (p < 0.001) and groups 'b' and 'c' (p < 0.001)