condition mean min max ZT0-3 5.1356850000000005 5.1356850000000005 5.1356850000000005 ZT4-7 3.280505 3.280505 3.280505 ZT8-11 5.25469 5.25469 5.25469 ZT12-15 6.151305 6.151305 6.151305 ZT16-19 7.70059 7.70059 7.70059 ZT20-23 5.554539999999999 5.554539999999999 5.554539999999999