condition mean min max ZT0-3 4.7806049999999995 4.142415 5.31296 ZT4-7 4.15612 4.15612 4.15612 ZT8-11 3.53457 3.53457 3.53457 ZT12-15 5.049322500000001 4.95915 5.139495 ZT16-19 4.944465 4.944465 4.944465 ZT20-23 5.123794999999999 5.123794999999999 5.123794999999999