condition mean min max ZT0-3 22.060000000000002 22.060000000000002 22.060000000000002 ZT4-7 16.06775 16.06775 16.06775 ZT8-11 16.954 16.954 16.954 ZT12-15 18.03575 18.03575 18.03575 ZT16-19 22.92785 22.92785 22.92785 ZT20-23 21.51745 21.51745 21.51745