condition mean min max ZT0-3 12.44669031325 11.3693073565 13.52407327 ZT4-7 6.398790386249999 6.258440396 6.539140376499999 ZT8-11 10.71276507975 7.6669977345 13.758532425 ZT12-15 11.23205547525 9.986572568 12.4775383825 ZT16-19 6.0956933284999995 5.902754616499999 6.2886320405 ZT20-23 4.305775960749999 3.4663533165000002 5.145198604999999