condition mean min max ZT0-3 5.3075975 5.022105 5.59309 ZT4-7 7.849505000000001 7.849505000000001 7.849505000000001 ZT8-11 10.31804 10.31804 10.31804 ZT12-15 0 0 0 ZT16-19 6.057465 6.057465 6.057465 ZT20-23 4.557370000000001 4.557370000000001 4.557370000000001