condition mean min max ZT0-3 0.8590281666666667 0.2310385 1.35551 ZT4-7 0.278458 0.278458 0.278458 ZT8-11 0.43042900000000006 0.43042900000000006 0.43042900000000006 ZT12-15 0.4156455 0.3621405 0.4691505 ZT16-19 0.8755360000000001 0.8755360000000001 0.8755360000000001 ZT20-23 1.0499605 1.0499605 1.0499605