condition mean min max ZT0-3 5.623889999999999 5.623889999999999 5.623889999999999 ZT4-7 4.33766 4.33766 4.33766 ZT8-11 5.102335 5.102335 5.102335 ZT12-15 5.39683 5.39683 5.39683 ZT16-19 6.583679999999999 6.583679999999999 6.583679999999999 ZT20-23 4.96568 4.96568 4.96568