condition mean min max ZT0-3 337.535451 337.535451 337.535451 ZT4-7 277.277997 277.277997 277.277997 ZT8-11 255.2867315 255.2867315 255.2867315 ZT12-15 415.7545715 415.7545715 415.7545715 ZT16-19 633.8874355 633.8874355 633.8874355 ZT20-23 683.102574 683.102574 683.102574