condition mean min max ZT0-3 18.286450000000002 18.286450000000002 18.286450000000002 ZT4-7 14.663250000000001 14.663250000000001 14.663250000000001 ZT8-11 18.453850000000003 18.453850000000003 18.453850000000003 ZT12-15 20.0148 20.0148 20.0148 ZT16-19 25.56395 25.56395 25.56395 ZT20-23 18.086350000000003 18.086350000000003 18.086350000000003