condition mean min max ZT0-3 1803.078211 1803.078211 1803.078211 ZT4-7 1533.2866445 1533.2866445 1533.2866445 ZT8-11 1630.3239525 1630.3239525 1630.3239525 ZT12-15 2453.123797 2453.123797 2453.123797 ZT16-19 2455.6778125 2455.6778125 2455.6778125 ZT20-23 3926.8084734999998 3926.8084734999998 3926.8084734999998