condition mean min max ZT0-3 11.327354 11.327354 11.327354 ZT4-7 14.6428385 14.6428385 14.6428385 ZT8-11 18.3826975 18.3826975 18.3826975 ZT12-15 14.137254500000001 14.137254500000001 14.137254500000001 ZT16-19 11.890661999999999 11.890661999999999 11.890661999999999 ZT20-23 11.991769999999999 11.991769999999999 11.991769999999999