condition mean min max ZT0-3 10.759395 10.759395 10.759395 ZT4-7 8.90428 8.90428 8.90428 ZT8-11 10.084029999999998 10.084029999999998 10.084029999999998 ZT12-15 11.13094 11.13094 11.13094 ZT16-19 22.54955 22.54955 22.54955 ZT20-23 14.0368 14.0368 14.0368