condition mean min max ZT0-3 256.11761 256.11761 256.11761 ZT4-7 164.99796600000002 164.99796600000002 164.99796600000002 ZT8-11 127.383193 127.383193 127.383193 ZT12-15 170.5818335 170.5818335 170.5818335 ZT16-19 155.95613550000002 155.95613550000002 155.95613550000002 ZT20-23 139.4668995 139.4668995 139.4668995