condition mean min max ZT0-3 9.56973 9.56973 9.56973 ZT4-7 10.39472 10.39472 10.39472 ZT8-11 10.9641865 10.9641865 10.9641865 ZT12-15 9.564606999999999 9.564606999999999 9.564606999999999 ZT16-19 10.1699625 10.1699625 10.1699625 ZT20-23 9.718293500000001 9.718293500000001 9.718293500000001