condition mean min max ZT0-3 769.072247 769.072247 769.072247 ZT4-7 1392.2227395 1392.2227395 1392.2227395 ZT8-11 1264.3389745 1264.3389745 1264.3389745 ZT12-15 1022.189157 1022.189157 1022.189157 ZT16-19 418.00234450000005 418.00234450000005 418.00234450000005 ZT20-23 229.19527399999998 229.19527399999998 229.19527399999998