condition mean min max ZT0-3 0.3376246666666667 0.25865900000000003 0.386183 ZT4-7 0.285371 0.285371 0.285371 ZT8-11 0.658097 0.658097 0.658097 ZT12-15 1.7782375000000001 1.56563 1.9908450000000002 ZT16-19 1.1254849999999998 1.1254849999999998 1.1254849999999998 ZT20-23 0.8041825 0.8041825 0.8041825