condition mean min max ZT0-3 5.50763 5.50763 5.50763 ZT4-7 2.98447 2.98447 2.98447 ZT8-11 5.64622 5.64622 5.64622 ZT12-15 9.490179999999999 9.490179999999999 9.490179999999999 ZT16-19 10.944600000000001 10.944600000000001 10.944600000000001 ZT20-23 7.683965000000001 7.683965000000001 7.683965000000001