condition mean min max ZT0-3 79.4514269975 43.08554316 115.817310835 ZT4-7 127.5559353 125.2888428 129.8230278 ZT8-11 68.92531929500001 53.41832006 84.43231853 ZT12-15 18.9336908215 16.76228364 21.105098003 ZT16-19 20.517257115 20.1451624 20.889351830000003 ZT20-23 15.6842965345 13.255351119 18.11324195