The experiences of supporters (left) at five career stages were considered: PhD students (green), postdocs (red), early-career group leaders (less than five year since independence; purple), mid-career group leaders (between five and ten years since independence; light blue) and late-career group leaders (more than ten years since independence; dark blue). The career stage of the person they last supported (including individuals at other career stages; grey) is reported on the right. The majority of PhD students and a large proportion of postdocs support someone who is at the same career stage. However, those with official leadership roles mostly provide help to PhD students and, to a lesser extent, to postdocs. Only a minority of group leaders provided support to another group leader, despite 47.4% of early-career group leaders, 37.8% of mid-career group leaders and 23.9% of late-career group leaders reporting they were themselves struggling with their mental health at the time of support.