condition mean min max ZT0-3 0.9764338204999998 0.577513453 1.3753541879999998 ZT4-7 1.9534512622500002 1.5330892550000002 2.3738132695000003 ZT8-11 2.30754095575 2.073193146 2.5418887655 ZT12-15 1.681092165 1.427712121 1.9344722090000002 ZT16-19 1.9867875447499999 1.3321864395 2.6413886499999997 ZT20-23 4.2793467915 4.1127825305 4.4459110525