condition mean min max ZT0-3 42.719348 42.719348 42.719348 ZT4-7 39.131636 39.131636 39.131636 ZT8-11 40.6329675 40.6329675 40.6329675 ZT12-15 44.916149000000004 44.916149000000004 44.916149000000004 ZT16-19 45.9080965 45.9080965 45.9080965 ZT20-23 43.480229 43.480229 43.480229