condition mean min max ZT0-3 4.8576025000000005 4.60281 5.112395 ZT4-7 3.185995 3.185995 3.185995 ZT8-11 3.821795 3.821795 3.821795 ZT12-15 0 0 0 ZT16-19 5.1367 5.1367 5.1367 ZT20-23 4.757395 4.757395 4.757395