condition mean min max ZT0-3 10.937249999999999 10.937249999999999 10.937249999999999 ZT4-7 12.3138 12.3138 12.3138 ZT8-11 4.150265 4.150265 4.150265 ZT12-15 4.880364999999999 4.880364999999999 4.880364999999999 ZT16-19 5.316 5.316 5.316 ZT20-23 6.99394 6.99394 6.99394