condition mean min max ZT0-3 136.239548 136.239548 136.239548 ZT4-7 123.35439350000001 123.35439350000001 123.35439350000001 ZT8-11 147.32066600000002 147.32066600000002 147.32066600000002 ZT12-15 140.896947 140.896947 140.896947 ZT16-19 162.47294349999999 162.47294349999999 162.47294349999999 ZT20-23 161.70385 161.70385 161.70385