GSTM1 and anemia: Among the 77 participants with Hb < 7 g/dL reported at any time point (including enrolment), only 37 (48.1%) had some follow-up information available; 29 (78.4%) of them recovered from severe anaemia within 7 days, and 8 (21.6%) were still severely anaemic after 7 days, with no further follow-up data available.